Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f7fd7b4c02c425…

MALICIOUS

PDF

45.8 KB Created: 2020-11-03 01:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f97c6494668a81f01c7f1ba65dfabddd SHA-1: 1713638f97072403a9b8bfacf2d684b7b63262d1 SHA-256: f8f7fd7b4c02c42544fcc4729d0231a309d3920333e91283baf19092d3efd065
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests an attempt to lure the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=saving+francesca+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5f8e454a1a7d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5f91e66123536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5f8b9bf94d2a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/2decd58f-5b3b-4221-a2b7-871bae958ad3/disifoperowirobugenobud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/darth_vader_happy_birthday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6e2c7e-f0fb-45c3-a6ab-82038417e663/andras_mocsy_pannonia_y_superior_moe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4749/1486/files/58139459870.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5715/0655/files/literature_a_portable_anthology_4th_authors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/bimuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9983/8358/files/32450228384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/manual_pull_station_notifier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1333/8822/files/16081253881.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B4 5432 bytes
SHA-256: ccc26d1585e99e04bbec584243a38be4770db122f265ff9228d9adacbcdf88f3
font_01_sfnt_off00007823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7823 6096 bytes
SHA-256: 400d97edd7ebc843938de3cdab2b555a1328d60cd0154915083304386710c093
font_02_sfnt_off000087d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D3 10172 bytes
SHA-256: 35b3dda263f00a9b928e6767ed9bcc5f783fc0c47ca6372eabd99eba16744300

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