Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd67b1221425beb1…

MALICIOUS

PDF

44.5 KB Created: 2020-10-04 22:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5884d5b44f037c38a80f97594d3d0594 SHA-1: 33cf9c267985f857b45070665f695a176ea48a94 SHA-256: bd67b1221425beb1f5151ba04ba9de91ccd02ac7fc8542b470444634e6894066
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 hosted on various domains, suggesting a link farm or SEO poisoning attempt. One URL, https://cctraff.ru/pify?keyword=futur+proche+van+faire, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=futur+proche+van+faire In PDF document text
    • http://files.twohandsrescue.org/uploads/1/3/1/3/131398440/xidomogalinamom-xewago.pdfIn PDF document text
    • http://files.roadhomefredericton.com/uploads/1/3/2/6/132682134/f5bd79237c.pdfIn PDF document text
    • http://files.naifamt.org/uploads/1/3/1/4/131484133/kikum-romolifujivowob-duzijuka.pdfIn PDF document text
    • http://zafeba.piltzfamily.waggamatters.com/uploads/1/3/0/9/130969950/770181b0.pdfIn PDF document text
    • http://rilusa.aahsanguilla.com/uploads/1/3/1/4/131407592/8354997.pdfIn PDF document text
    • http://pojexo.bosombuddiesbenefit.com/uploads/1/3/0/8/130813785/3787413.pdfIn PDF document text
    • http://files.soshadysunglasses.com/uploads/1/3/1/4/131406344/7634672.pdfIn PDF document text
    • http://suvomu.honoraryislander.com/uploads/1/3/0/7/130739309/8aa94a103e0f5fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/townson_rose_funeral_home.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/95862989000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2009/4120/files/thomas_of_lancaster.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/4555/6902/files/cruel_beauty_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/negative_scale_factor_of_enlargement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6372/4200/files/lamozesapopinuvenetabit.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A26 4908 bytes
SHA-256: eacf57c7366b3ccfd46669c3ae196cd36b2ff0b4c9f821815ac4b61261ac703c
font_01_sfnt_off00006ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE6 11500 bytes
SHA-256: 567f28109d6c9b83e824e71c455558c172a7fc2e518ee361629012ed4b7d4dbd
font_02_sfnt_off00009041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9041 16084 bytes
SHA-256: ce90dcb8f80a691a226d66d7b9fb40db13b52946125f6d312f8860abae454107

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