Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf2d324cde073e5…

MALICIOUS

PDF

64.1 KB Created: 2020-08-19 05:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc76af77759358835e618453ea8cbf67 SHA-1: eebcbb0be741106216ee6f665e7775c0364b7044 SHA-256: 6bf2d324cde073e5aa68714f83674fc22b0d57ca3924ec69b5f4f61a47140cfe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically a link farm designed to host numerous PDFs. The primary malicious URL identified is a redirector that appears to be used for distributing malware or phishing content. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector.

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.cc/pify?keyword=bakrid+movie+songs++in+tamil
    • http://files.yourwebpass.com/uploads/1/3/1/4/131438188/921eb55b5b52.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/favogupavik.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/zelefixob.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/dugasitesitufotiso.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/jepebiwobilokuwon.pdf
    • https://cdn.shopify.com/s/files/1/0438/6449/0149/files/curriculum_vitae_format_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/43549245418.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lovukapovilelogitolosir.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/cockatiel_diet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/85662231492.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/zefana.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/honeywell_6150_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/4282/4611/files/73486996177.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/vudopowozupanipe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000a1e4.bin
a4e306c4a88a2a6508f9de45522ff825e80d85d90bbd74adef4a963046f6541d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA1E4 9904 bytes
font_00_sfnt_off000090a0.bin
6d42d39b0645a6b59ae8b927377bb01fc96d6cd25db7716af21812a6ae807fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A0 5104 bytes
font_02_sfnt_off0000bc48.bin
efe5048abb5f56cfdb8950c96598f7192f6d465a57a85c36723ac3af85f5b02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC48 12552 bytes
font_03_sfnt_off0000e4ec.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 4324 bytes

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