Malicious PDF — malware analysis report

Static analysis result for SHA-256 528c420ebf81d0f7…

MALICIOUS

PDF

72.1 KB Created: 2021-01-06 20:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 42208c268d7e9abb39dfa573c86aadec SHA-1: e8f46cda37736de0cc52b1cf91afe952a17baf07 SHA-256: 528c420ebf81d0f75cbb89487e3ca953ec24c2689021afb10e58002549504b8f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'gettraff.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Microsoft animated gifs free'. The presence of multiple external PDF links, some of which are likely part of a link farm, indicates an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=microsoft+animated+gifs+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5fce60cc8f286.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/7275833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5fbcafe2d420d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5fad81fac211c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_5fb028c667b89.pdfIn PDF document text
    • https://mutoxikaxinabab.weebly.com/uploads/1/3/4/8/134886861/3439221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_5fa6115236fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448328/normal_5fa33c0ee4488.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://s3.amazonaws.com/tibanepoxilibud/financial_analysis_and_reporting_syllabus_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/58227236454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6adb07cf-7916-4dd7-af2a-d2ee53f35750/mortal_kombat_icon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507fc817-b476-48be-b17d-62b9fa9d5a5d/54697289764.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_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 5104 bytes
SHA-256: 09f3b7e4a4315aa54b2b9c3a4a42bb85a1f34af478ddc5c5b1e69c9f4edd2b12
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 10080 bytes
SHA-256: a1433f780b0d53573a74536cca7c7c5b7e97ba5c829d29bfdbb89af191d12922
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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