Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4dcb6c168352d9…

MALICIOUS

PDF

45.2 KB Created: 2020-08-20 14:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dae792356280935f4ac27ced1955cc56 SHA-1: 5a23dd5ad4f6bed0de6abf1ea57ee2dd2a50a83c SHA-256: 2c4dcb6c168352d91354d0c02a11b9ac37b1df37477b5c13282009d59ae634db
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same lure text and URL as the redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm intended to improve search engine ranking for malicious content.

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/pify?keyword=daredevil+tv+series+parents+guide
    • http://xuxuzidim.jeffreytlowell.com/uploads/1/3/0/7/130739963/b7292a0aeade0e8.pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://files.pietrogiordanophotography.com/uploads/1/3/1/3/131383760/b94828c2a9d57.pdf
    • http://files.alpenaoptimistclub.com/uploads/1/3/0/7/130775917/jamolem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2496/5019/files/69775002325.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/baluvafivubodibowij.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/48995766622.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/kabusit.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5589/files/what_are_norms_and_values.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/blockchain_using_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/93233609651.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/kokuselazuziritutopa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8663/3377/files/best_buy_black_friday_deals_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/the_economist_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/96525853611.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/pokusik.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/rilaziviwumafevesaminoxi.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_off000071e8.bin
624cbec82511b1dbf84158a8037c07f0054d54f3f87ad4ee7d594e9286a3a06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E8 5188 bytes
font_01_sfnt_off000083a4.bin
d0eb242d404e8fb293c1b0329e5978ae711ef65e6332704b5d9f1cebcc61bb5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A4 10604 bytes

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