Malicious PDF — malware analysis report

Static analysis result for SHA-256 c843ac79b567d076…

MALICIOUS

PDF

41.6 KB Created: 2020-10-30 20:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 90f6fca670a036e83f33867104c631d6 SHA-1: 532f502b318be13552f53b47547bb48e54e6d01d SHA-256: c843ac79b567d076c162c694158e93a31207ee3fcf23a4326996dc45d1f37130
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of the lure, suggesting a phishing or scam attempt.

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://cctraff.ru/strik?keyword=cara+menang+sbobet In PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/35ae1f.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/felavowesegufifoj.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/4413828.pdfIn PDF document text
    • https://sudateneturoxa.weebly.com/uploads/1/3/4/3/134322726/bumivowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8f2a6e17517.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/fuzomama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petikamov/ataxia_cerebelosa_en_perros.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/pure_caffeine_powder_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/manual_arts_high_school_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6999/5691/files/gusasagumibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4f983a-c27c-4d18-8924-8aabd766b8e1/marshmallow_challenge_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/favage.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/monibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4135/5454/files/94326992549.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/38942094992.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 5016 bytes
SHA-256: c31107f9a0f81feb533b04685d8beae4b475af9114d5c3334f90ac1038abb132
font_01_sfnt_off000077f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F0 9904 bytes
SHA-256: b5eb20336392dea7997aae3143473a837d8997e031c227e27d847c95a33b0d2b

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