Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5795a7c59b366a…

MALICIOUS

PDF

49.9 KB Created: 2020-10-29 12:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 838832227bf23c39100a9fc313c7200f SHA-1: e66ce84ceded300a2c82320c880675fb428d22d1 SHA-256: 2a5795a7c59b366a661b156bf2fcbad9439a2929d983a2a72d41dd447951cf49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent link, 'https://ggtraff.ru/strik?keyword=blue+snowball+pop+filter', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several benign-looking URLs, likely intended to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=blue+snowball+pop+filter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5f92674ac3dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f8fd1f25379f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_5f9a91b99f5b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5f949f63ae04a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0246/9285/files/32365176393.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/28205051227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5052520-d389-42e7-8058-d42724ebedb7/rupubebemumodukijiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba234cbc-1968-4dcd-ab2c-c73fc8021969/87854305851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86fa05e-ea79-4d52-b22c-33df6230c2fd/begalusojebaronaxitafov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e796de-ed61-4885-bdad-e5965bc0c4a8/ark_shock_darts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51898853-8364-4c8d-aa8f-c7578f60bfc2/609170134.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/balcony_steel_grill_design_catalogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272af0c0-0a2e-46dd-b5b7-7968c5093c1f/53193496558.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5001/5152/files/47967918939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4049375d-4df3-4b81-a157-683afd6b47ee/1798355275.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/faxuvuzuzoxagekerali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4571/6119/files/pubegatibegomojopedare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254bc215-c682-4eaa-90bf-e273efd3696c/52093878135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62da84a2-7141-4ced-b1ff-8be0c9500030/nibilogubibazelov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4366/0186/files/60519109119.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/unblocked_games_76_learn_to_fly_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1454/3301/files/64380313492.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/keychain_lighter_flint.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/saxidebikof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3432/8219/files/nonlinear_programming_dimitri_bertsekas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9245/2523/files/garavilomowesikajus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bdb907e-08be-48b4-b43f-946ab143adb5/wigozajexuwawuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0512/4503/files/lizazo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 5056 bytes
SHA-256: f02e4eefe1698f0e1af40725a50389f6d9c865db7118e044bf2cc9fa117ad4c0
font_01_sfnt_off0000861a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861A 11188 bytes
SHA-256: a032eb5821c0e3bd3963ed5342a40dd8b06a363360795aebbd6eb77a0c40f571
font_02_sfnt_off0000ac0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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