Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34e677cf76f6fd9…

MALICIOUS

PDF

53.6 KB Created: 2020-11-01 18:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c1ffc8b6c187ac3392de0fdb568ede68 SHA-1: 2922d5cf19756ba291b0a0179b4e2a85e9cb2859 SHA-256: c34e677cf76f6fd95425daf11fd1eb6c4809bdbaa56c53b61f9d45d0eefc1651
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm heuristic suggest the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

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://ttraff.club/pify?keyword=regular+polygons+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f8d2a9e3829a.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/52450180074af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f939f8e176df.pdfIn PDF document text
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/7742407.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/695d0481e.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/henghuili-files/45163223780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4baa3469-7a7a-47cd-893e-c4f3f1851b91/21521752998.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/architecture_risc_et_cisc.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/blade_runner_2049_torrents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55dfc562-efba-4165-828b-af144e7630b0/13813157113.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/plural_of_heron.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/76085033484.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/68043023700.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/merittrac_aptitude_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/38990055129.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a040.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA040 23876 bytes
SHA-256: bbe80ff2b98996b75f572ab6b9c3d35bbbc81a8acb36076ad06fc55a6ab44e37
font_00_sfnt_off000069a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A5 5568 bytes
SHA-256: 2fbbe603d7011dc99dd3213c2f76f9e6bdfaa40b6ab6beb60a9ee5f9aa9e266f
font_01_sfnt_off00007cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB8 10404 bytes
SHA-256: da0a9a51f2c85e3dfd33412c42bb8cc1e9c3ca3932cbb02d3a40c084755ddf84

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