Malicious PDF — malware analysis report

Static analysis result for SHA-256 61de29457862d50b…

MALICIOUS

PDF

58.8 KB Created: 2020-08-17 06:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae3fece32d95bac5b9ad5d62d015c2a9 SHA-1: d252999c21fcd4239897461d6a39368b75ed70dd SHA-256: 61de29457862d50b2b5fb90e829dcf66262f015c417153eeebe7936ba095ebd1
154 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 malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'Cdi torque wrench operation manual'. The presence of a large number of external PDF links, many pointing to Shopify, indicates a potential link farm used for SEO poisoning or distributing further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=cdi+torque+wrench+operation+manual
    • http://files.thestudyingmom.com/uploads/1/3/1/3/131380107/zisesuxupuwo-lizesefajom-xetiwepenuka-xalagatuwuno.pdf
    • http://files.one9apparel.com/uploads/1/3/2/6/132681304/1c4895534.pdf
    • http://files.techedmn.com/uploads/1/3/1/6/131636712/soxax_tupoluzudaken_babuguva_marunej.pdf
    • http://wodisevuf.upsilonthetatau.org/uploads/1/3/1/4/131437462/90bf1a32c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/halfworlds_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/73863253532.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lasuzopaxikabade.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/26483599643.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/72254018079.pdf
    • https://cdn.shopify.com/s/files/1/0428/6581/9814/files/aulularia_plautus.pdf
    • https://cdn.shopify.com/s/files/1/0440/8338/0376/files/52056479894.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/keroluxezuzova.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1671/files/rokenepilawumogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/kuretoxupaxeteromodolig.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092ed.bin
e0b5bfec8c1ec1d84dee9f6e03bf9e37425f529b402162bc0bdcf11226c44a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92ED 5256 bytes
font_01_sfnt_off0000a4ae.bin
a5838d13b27360d86f16bcc652a7b286b10fb00c511e2e5d64703332b92919ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AE 10588 bytes
font_02_sfnt_off0000c92b.bin
84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 16060 bytes

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