Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a132e370ee50dd…

MALICIOUS

PDF

51.2 KB Created: 2020-07-26 10:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d535ded8e8d65e063a6598c7faeec6e8 SHA-1: 04c4b34af6c4494b0d36aed1c5781666cd3261b8 SHA-256: f0a132e370ee50dd0922e15757b48dde5f90e1bd648fde9062a0204487da9538
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'ttraff.com'. Another critical heuristic identified a PDF link farm, suggesting an attempt to manipulate search engine results to distribute malicious PDFs. The document body, though heavily obfuscated, contains keywords related to 'private equity fund accounting book pdf', likely serving as a lure.

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/wb?keyword=private%20equity%20fund%20accounting%20book%20pdf
    • http://files.ryangardnerjewelry.com/uploads/1/3/1/3/131379748/6416188.pdf
    • http://files.yorksurgical.com/uploads/1/3/1/6/131637701/tuzobelik.pdf
    • http://files.andrewdosshistory.com/uploads/1/3/2/6/132682640/nesiviwetax.pdf
    • http://files.summerslevin.com/uploads/1/3/1/8/131871462/362124.pdf
    • https://cdn.shopify.com/s/files/1/0429/9037/0975/files/nadarapelavowoma.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/35227634632.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/files/37339025982.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/tepirobemapegonena.pdf
    • https://cdn.shopify.com/s/files/1/0430/9362/2935/files/xigebuzuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/modubazipagazekok.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/41596852388.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/44920044832.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/17029021514.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/13506848998.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/48016216100.pdf
    • https://cdn.shopify.com/s/files/1/0429/2293/4435/files/goborogalogijirode.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/
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a37.bin
9704a5eb9aca99a598fb60da566a43dd816fdbd7fd77cdcba1468bb950666196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A37 5488 bytes
font_01_sfnt_off00009cef.bin
b069ee9b5feb588ddd2689b36ec5a93103e7e9fa5e314ad31633f21c46ce016a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEF 10128 bytes

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