Malicious PDF — malware analysis report

Static analysis result for SHA-256 675ad572781a59a3…

MALICIOUS

PDF

50.8 KB Created: 2020-08-22 21:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0328aba0e02331624b2918c46019c392 SHA-1: 05bb029d0dffa9f4eb60f1676854a6c1b60eed8a SHA-256: 675ad572781a59a341e0b6b6905b0a64b2f114ef2ee0be742cb1d784d9735e5b
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 a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=video+wallpaper++for+pc', suggesting a lure to trick users into clicking malicious links. 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://ttraff.ru/pify?keyword=video+wallpaper++for+pc
    • http://files.gratitudeandgrace.net/uploads/1/3/1/4/131455463/be2bf20a687d.pdf
    • http://files.jropro.com/uploads/1/3/1/4/131437508/4880734.pdf
    • http://gekuk.southerncommunitystudy.org/uploads/1/3/0/7/130739206/xatebesopa-mokosipireje-pilemom-junerosenof.pdf
    • http://files.leftradialsupport.com/uploads/1/3/1/3/131380292/dedotowukukotuwu.pdf
    • http://muwatifo.adventurehorizons.com/uploads/1/3/1/4/131406436/cda8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/10286790666.pdf
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/taekwondo_black_belt_forms_koryo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/lufewofuwefaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/norton_free_trial.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/muzadani.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/appiani_maneuver.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/surviving_sepsis_campaign_international_guidelines_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/29756209356.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/96968551876.pdf
    • https://cdn.shopify.com/s/files/1/0452/0306/2933/files/xubekasinili.pdf
    • https://cdn.shopify.com/s/files/1/0435/4683/7151/files/satan_libro_ego.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/23935549829.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c7e.bin
2fd1ef4d650ab439b19b921d8c9580160aa5684d70c991eeef729c1675d5b4a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7E 4632 bytes
font_01_sfnt_off00008c5a.bin
1a53947322db643de119a55140ed55352295d5e06a31a3505fac93cb2385dcc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5A 10592 bytes
font_02_sfnt_off0000b067.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB067 4324 bytes

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