Malicious PDF — malware analysis report

Static analysis result for SHA-256 337158d0f44d1da4…

MALICIOUS

PDF

39.2 KB Created: 2020-07-09 13:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4df9cc9b059c536176d3f2b9780a335 SHA-1: 33581ce614636baf088c0c2a9d5abb27f456a0cd SHA-256: 337158d0f44d1da430904d4a041a39c6f7032d9fc64f877725cae553f009e96a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF hosting sites, a technique often used to obscure malicious redirects. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=computational%20chemistry%20book%20pdf'. The document body text also contains this URL and numerous other PDF links, reinforcing the lure. No scripts were extracted from this sample.

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/wb?keyword=computational%20chemistry%20book%20pdf
    • http://files.metaphysicsfirst.com/uploads/1/3/0/7/130740127/1898948.pdf
    • http://files.pauladixonphotography.com/uploads/1/3/0/9/130969855/3a7f0f24edfb.pdf
    • http://files.praxiscoffee.com/uploads/1/3/0/7/130775902/8b525b72bedc9fc.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.phsboosters.org/uploads/1/3/1/4/131408864/givolorubogi-varupowura.pdf
    • http://files.hembladeacupuncture.co.uk/uploads/1/3/2/6/132682290/d1726d9d2c.pdf
    • http://files.brandsview.com/uploads/1/3/1/3/131381677/menug-gavegine-fekutavisa.pdf
    • http://files.skincareauburn.com/uploads/1/3/1/4/131437832/2887345.pdf
    • https://duxadaforege.files.wordpress.com/2020/06/37528687626.pdf
    • https://konivopuwu.files.wordpress.com/2020/06/gakurakewa.pdf
    • https://sekaronokom.files.wordpress.com/2020/07/76963979197.pdf
    • https://kusulubir.files.wordpress.com/2020/06/tasanuvizupo.pdf
    • https://konoxadejuk.files.wordpress.com/2020/07/demufijunuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80170273674.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.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_off00005b48.bin
f590b2355c4a7f44ba635d889bc8ecb2a4c9b3f46a82f093b3b5dc93a394e4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B48 5608 bytes
font_01_sfnt_off00006e26.bin
60a0aa0052ff34560c22199ff21e326ecb1fe2b53a2056567c6ebc7a6d247207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E26 9848 bytes

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