Malicious PDF — malware analysis report

Static analysis result for SHA-256 c410a63752906c7f…

MALICIOUS

PDF

44.0 KB Created: 2020-08-01 22:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25d84fb32177bce5bdc9583ad6a36733 SHA-1: 9923eb584b11ba47a0de71e2c6e7bbd912b108cd SHA-256: c410a63752906c7f64a12a1c3dfb17a7b83a8dd11b5ae5b4172490ad65c4e3d5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text "German learning lessons pdf" and the malicious URL, suggesting a lure to trick users into visiting a malicious site. The ML classifier strongly indicated maliciousness.

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/wb?keyword=german%20learning%20lessons%20pdf
    • http://files.abbydecoratingden.com/uploads/1/3/0/7/130740211/6279810.pdf
    • http://files.democraticclubofthewoodlands.com/uploads/1/3/0/7/130740563/0d32fc94.pdf
    • http://files.handhills.ab.ca/uploads/1/3/2/6/132695874/b6655.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/43930646239.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/gixakewujipebotajiten.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/20055929634.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/85701135345.pdf
    • https://cdn.shopify.com/s/files/1/0437/0612/2393/files/32992151512.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/dazij.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/65183137983.pdf
    • https://cdn.shopify.com/s/files/1/0431/0931/8813/files/nakur.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/kilenaso.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/41824637929.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/62286918011.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/70097032306.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/4620451447.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/pagajoven.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/puwijalalunasupitufufo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000656f.bin
d54fd319363752ef951f5b494e4aeace561856a1cb4273fe2e01f918164b44a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656F 5392 bytes
font_01_sfnt_off000077a4.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A4 1800 bytes
font_02_sfnt_off00008032.bin
a1a5e5568440acc1fe0c833a9470037ba98206f28e1cedf6ee7c70e1252e75fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8032 10100 bytes

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