Malicious PDF — malware analysis report

Static analysis result for SHA-256 5746faf28267dcae…

MALICIOUS

PDF

54.9 KB Created: 2020-08-06 12:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce82200fe054f8990724881c1f186a6f SHA-1: cac1d2acf84192b9b01fe14a5803488b7720e5de SHA-256: 5746faf28267dcae6f3c85e16396d79eef268716e1df8043d18f6d37658908f0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, including a primary redirector at ttraff.ru. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead users to potentially harmful content. The document body itself is heavily obfuscated and contains the malicious URL, suggesting a lure for phishing or malware distribution.

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=business+strategy+model+pdf
    • http://files.srtatorres.com/uploads/1/3/0/8/130813696/445950.pdf
    • http://xofewan.sanderlingproductions.net/uploads/1/3/0/8/130874038/d67d4408a5f1b1.pdf
    • http://files.theofallonantlercompany.com/uploads/1/3/1/6/131606745/4568783.pdf
    • http://files.rug-cutters.de/uploads/1/3/1/4/131438468/vopafoki.pdf
    • http://files.fablabav.com/uploads/1/3/2/7/132712116/zipodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/tosezavewenajoziv.pdf
    • https://cdn.shopify.com/s/files/1/0434/3994/7932/files/95109131770.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/73561567776.pdf
    • https://cdn.shopify.com/s/files/1/0437/8266/8437/files/bedufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/xuvuxufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/venosemanimerobadesowolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/letewupodeluzejif.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0625/files/26360556339.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96328102714.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/76528516659.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/renorapepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5606/2876/files/44069552670.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_off000098df.bin
8da1e2b909ec3cabb0f3fa92dcc0a8ecb4093842884d2b0234484ff4936bb4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98DF 5512 bytes
font_01_sfnt_off0000ab99.bin
a8a1b6056beff453214ae92bf4d9a82798837153a6aa3aef178a657849b42fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB99 10280 bytes

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