Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b6f008478e0683…

MALICIOUS

PDF

45.8 KB Created: 2020-07-30 14:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eddd603d93cc866fa4b20ed835ecf6cc SHA-1: cfb48074373426b681524a71d4ee506920dd2275 SHA-256: 77b6f008478e06837948775915bfab7e8d565ce32e1a4843fbec05a76a136d0d
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, masquerading as an 'aptitude test formulas pdf', which redirect to external URLs. One of these URLs, 'https://ttraff.ru/pify?keyword=aptitude+test+formulas+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the malicious redirector strongly suggest a phishing or content-farming attack.

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.ru/pify?keyword=aptitude+test+formulas+pdf
    • http://files.whites-butchers.com/uploads/1/3/0/7/130775413/fujimopozut_xixonisalazokix_xifuxesilivo_wubexok.pdf
    • http://files.rebeccagraceandrews.com/uploads/1/3/1/8/131871535/tezogi.pdf
    • http://files.fetrowphoto.com/uploads/1/3/0/8/130873795/tigevajadowirifon.pdf
    • http://files.aplusdecoratingservices.com/uploads/1/3/1/0/131070051/f1a141.pdf
    • http://files.serafinureno.com/uploads/1/3/0/8/130814205/javefafigonok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/42461363763.pdf
    • https://cdn.shopify.com/s/files/1/0430/3850/7169/files/95227401388.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6953/files/81633409358.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/77311637323.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jokopewizemaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/70228682579.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/didebufexogiresaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/zivazovivutixizojixutol.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/giguvunixej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5018/files/bipimikoduninafozagabonav.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/nejojezidojakijibenas.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_off00006e11.bin
3b77ba39a4e3209b42d3514d5196f1315c0c8794694432c63a68ad32d8c3cff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E11 4952 bytes
font_01_sfnt_off00007ee8.bin
e3de73178f8c9b9450d775099875df32e43a32d0f0d0a12a3e68f0d4b3f0a231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE8 14028 bytes

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