Malicious PDF — malware analysis report

Static analysis result for SHA-256 7525979cbff0da7a…

MALICIOUS

PDF

45.6 KB Created: 2020-08-22 04:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6818c94acf02cbbb2d85d94be232761 SHA-1: 30c13254bc1dbe4aaba2e48cff36e934eecfcbe2 SHA-256: 7525979cbff0da7a735fbe848517debab39ce741b9d0a7694a18c0093cf76706
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a link farm pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.com/pify?keyword=wind+erosional+landforms, which is likely used to funnel victims to further malicious content or phishing pages.

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=wind+erosional+landforms
    • http://gesidobij.mainstagetheatre.com/uploads/1/3/1/6/131607240/8557768.pdf
    • http://files.empirelimited.co.uk/uploads/1/3/1/0/131070152/lefezidinazi_tawujikerogip_bujipuxo_lisuredikemado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6315/6642/files/the_knight_s_tale_by_geoffrey_chaucer.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/gobuzomifogokotejugod.pdf
    • https://cdn.shopify.com/s/files/1/0430/1147/3571/files/murikefufejujurabiwedo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/apertura_inglesa_ajedrez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/vewufevovojabeniliv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7164/2527/files/autodesk_maya_2010_64_bit_crack.pdf
    • https://cdn.shopify.com/s/files/1/0432/7017/6932/files/83473880686.pdf
    • https://cdn.shopify.com/s/files/1/0463/4676/4450/files/aankh_marey_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/9369304698.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/vuxijorojirevakuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/98579242814.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3346/files/29284010965.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_off00006956.bin
2afad0898e190aefee3a869dc73982313d171a149532f114278a36e564ccd6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6956 4776 bytes
font_01_sfnt_off0000796b.bin
0f793a36d470df295d80c0068b8cd858a40d37fad967f348c3243e113b82ace1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796B 10076 bytes
font_02_sfnt_off00009bbd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBD 4324 bytes

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