Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d90337d1d36a90…

MALICIOUS

PDF

41.4 KB Created: 2020-08-02 23:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2da2c4325b0713632de8bd11ae229ae SHA-1: 3dc16723951b5ef6b88556a443e1548fd2ba5985 SHA-256: 14d90337d1d36a9011ae49257944b35216ac49b6783043b8f477455a19d40dc0
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text that, combined with the heuristics, strongly suggests an advance-fee scam lure. The presence of many external PDF links, including to Shopify, indicates a link farm used to distribute the malicious content or to appear as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=csgo+auto+exec
    • http://files.kipnesslaw.com/uploads/1/3/0/7/130776142/medazub.pdf
    • http://files.nem-massage.com/uploads/1/3/0/8/130873718/xesore.pdf
    • http://files.marywardsamazingworld.com/uploads/1/3/0/7/130776462/7338434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0435/3950/files/kowabirizutuguz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/76293912432.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/nisabotozanud.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5002/files/murigamokigisolinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/stardew_valley_crop_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/25008475520.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/rofuweluloz.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/dabesalajuvosisorun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/pipajimafewarotakaloga.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/rapotagabixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/82228883212.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006548.bin
181212b8b4dbf89b51345249105186bfb5962313939d62a04ec8597f6a0b0d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6548 4812 bytes
font_01_sfnt_off000075c3.bin
93a698a3acb814e80ca1ad3c888d8c3dad60d19c77c6661209fea9d66c46751b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C3 10268 bytes

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