Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a53f96bad4363cb…

MALICIOUS

PDF

55.4 KB Created: 2020-09-20 07:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00f6239444ab8bb220c1afde774827b0 SHA-1: 358e4826c0a74004a322d5039ece6d137e5813f7 SHA-256: 4a53f96bad4363cb16aa570144e54534382341d1b5e3099ad9a1fa42db9dfae0
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains references to the target URL and other PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=sony+xperia+m+2+aqua
    • http://files.niaimani.net/uploads/1/3/1/8/131856173/redemezuralowuf.pdf
    • http://nejat.thedrewfund.com/uploads/1/3/0/8/130813458/3400412.pdf
    • http://kuzupumiz.lollandfalsterairport.dk/uploads/1/3/1/3/131384675/726e3690.pdf
    • http://gedigow.therenaivalist.com/uploads/1/3/1/4/131454065/vibelinukeni_nusebul_wiwixebagemifo.pdf
    • http://files.elementallstarsparentassociation.org/uploads/1/3/0/7/130775563/57789e6c309.pdf
    • https://8c6053b4-588b-4c79-948b-da78e9875de8.filesusr.com/ugd/dc8a8e_20a9bac5ae844334b07db439129e82fa.pdf?index=true
    • https://fea9f292-ad1e-4d6d-84c3-866f98ed1375.filesusr.com/ugd/784815_6266185303c04e72affd1f8f55063985.pdf?index=true
    • https://3fc85839-f791-433d-82fb-b2a41404bc86.filesusr.com/ugd/432b07_455810fd44f74df384a319f47efe4348.pdf?index=true
    • https://d3f51413-49b7-4f31-9390-c447f2f1cb7f.filesusr.com/ugd/e481ce_9138db8d5eda48bdb3633dd1f9242825.pdf?index=true
    • https://0d58c59d-9685-4e1c-8328-b7338eb1b9ef.filesusr.com/ugd/baef12_e20d1f6395f949038fb5e7b162ba6fd6.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/32635393201.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/26075715310.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/41884284874.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9547/files/thrust_ball_bearing_size_chart.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_off00009b76.bin
df640629553ac5cfcb82cf1e43380aca11649660a1e6107d201620fc635cdc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B76 5288 bytes
font_01_sfnt_off0000ad70.bin
e06ac75acf9299b1de0f569653a4735f2c19ce49e2e3b004ba4950855013ec05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD70 10272 bytes

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