Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe19865c3830c0ba…

MALICIOUS

PDF

53.5 KB Created: 2020-08-06 21:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375ca3dda3e96c45458b46abcb216ad0 SHA-1: 99307a646c00e48d7c7bdbef358c2e4883bc0792 SHA-256: fe19865c3830c0ba3f2a5aebdf0a3e3b42daf00cebe079062bbdec74c2a48537
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, https://ttraff.ru/pify?keyword=social+media+advertising+definition+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'social media advertising definition pdf', suggesting a lure. The presence of numerous links to Shopify-hosted PDFs, while individually benign, contributes to a link farm tactic. The ML classifier 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=social+media+advertising+definition+pdf
    • http://files.naui-italy.org/uploads/1/3/1/3/131398221/gosamaz.pdf
    • http://kizibal.americanbbq.co.uk/uploads/1/3/1/4/131454012/682ef76c85674.pdf
    • http://lekiveba.firstbaptistmartinsville.com/uploads/1/3/1/4/131453194/zomusumevoburuma.pdf
    • http://files.aureliotobias.com/uploads/1/3/1/4/131483391/6891807.pdf
    • http://files.mendedwingtheatre.com/uploads/1/3/0/7/130739398/vanare-gekirux-watubavol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/vofiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/pidakixoxidap.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/70353258292.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/wixubefuzobeko.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/jopolegagu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6983/1323/files/sdgs_agenda_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/xezagexugadotifibisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/78378023811.pdf
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/legekotob.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/31889196991.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/physics_laboratory_experiments_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1484/files/ligar.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000920c.bin
2f76d045f494b3e93587c4bd4f01e0920913cc0655edf8011df946df8834eb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920C 5636 bytes
font_01_sfnt_off0000a537.bin
1e4a513d88d6abbcc3de97c85b242fb4534473785f64f02f3765b9b3a0eee4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA537 10448 bytes

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