Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe9a0b78a1c4f05…

MALICIOUS

PDF

51.5 KB Created: 2020-08-08 03:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e40e8ccef53ff60f4bd64564163fa2 SHA-1: 42753e522454e71fe393c500e2fe0c45291adb53 SHA-256: 7fe9a0b78a1c4f056c4214654258f8857dca0240846416893368056c80b78d61
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=gdb+commands+in+linux+pdf', which is likely intended to lead the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=gdb+commands+in+linux+pdf
    • http://files.handymanofmarketing.com/uploads/1/3/1/8/131871569/zejoduzefegununene.pdf
    • http://files.outsideinstables.com/uploads/1/3/1/4/131453247/susojudesim.pdf
    • http://files.movethrough.com/uploads/1/3/1/0/131069899/damijevepatani-xigiwizix-pivorox-mivanibakelomi.pdf
    • http://files.sweetruthies.com/uploads/1/3/1/8/131871778/7098b888c92ab.pdf
    • http://files.newleafpsychiatry.net/uploads/1/3/0/7/130775221/nukoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/jukedabexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/wewolekanaxuwesiligeruko.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/98387371742.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/bagijipibenaduzika.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/marks_and_graham_monogram_maker.pdf
    • https://cdn.shopify.com/s/files/1/0428/8793/8211/files/96160974690.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/4533152639.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/boxudidapikemuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/judifun.pdf
    • https://cdn.shopify.com/s/files/1/0439/5371/7406/files/5470303693.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/88016600534.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/58736917875.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/79041557175.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bf1.bin
274c5513d9c49ededeb6810ff6b0e8174a3023b8b3280c81b1961502e7f043ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF1 5444 bytes
font_01_sfnt_off00008e69.bin
7221f37c7ccac68f92dfc6a62e9eb6312e10aa9a861c285b1b19ab7792d0fc81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E69 16336 bytes

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