Malicious PDF — malware analysis report

Static analysis result for SHA-256 57913a72ca3b3a74…

MALICIOUS

PDF

41.8 KB Created: 2020-08-05 03:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc144e80c3db3ae2df164a3f4a17f1c0 SHA-1: 8513d22be4ceb8f707cd496208c5e0c8c09ef989 SHA-256: 57913a72ca3b3a74e9b22a92dc141db032251d2df6b9c90b331e98fc172749a0
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link to a known malicious redirector. The document body, though obfuscated, contains the URL https://ttraff.com/pify?keyword=introduction+to+costing+methods+pdf, suggesting a lure to a fake content page. The ML classifier strongly indicated maliciousness, and the presence of numerous links to Shopify-hosted PDFs points to a link-farming SEO abuse technique.

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=introduction+to+costing+methods+pdf
    • http://files.juliegaulketracks.com/uploads/1/3/1/6/131606762/c6dbbfbe5c0.pdf
    • http://vigusik.dgdesignsjewelryandsupply.com/uploads/1/3/1/3/131383664/4310653.pdf
    • http://files.canyonfallsestates.org/uploads/1/3/0/8/130813777/5502980.pdf
    • http://dituxa.jwspropertyconsultancy.com/uploads/1/3/1/4/131438641/bapumut_dojinak_nilaw.pdf
    • http://files.gawlercalisthenicsclub.com/uploads/1/3/0/8/130814297/rasizovuwuvumi_kojiseteso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/93710281645.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8272/files/linijekadubuxuluwakenukid.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/45538346990.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/54986341355.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6849/files/11995044156.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/yuna_crush_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/2418/7549/files/49039295579.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/vugizifibugopevedobo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/liwijodufufomizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/gugutubebivuwelinuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/xorejetunipab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/zuxaxajujulurofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3681/files/garevagadomezopasesorofa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/jabudogibujofix.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_off00006491.bin
eeec74548e72fc69f17202bbbf529bad6e4e3c80959585f270e53b6b22095d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 5264 bytes
font_01_sfnt_off0000764d.bin
6c79c66fbbfdaf26dd14fc701f8f0227f31f710c1d03c703f887e79175b0e08e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764D 10440 bytes

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