Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf35bd8036f313b…

MALICIOUS

PDF

39.6 KB Created: 2020-08-08 18:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 678df08116fee39ce482b471a7868ded SHA-1: 1824ea4331a0a57e6a2700e58deeafc803b39084 SHA-256: 5cf35bd8036f313be8a0b014c45bcb7fc0b47f14ec4b008fcd9bfff687bb2143
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to improve search engine rankings. One of these links, 'https://ttraff.cc/pify?keyword=cellular+respiration+in+plants+pdf', leads to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the same URL and other PDF links, suggesting a coordinated effort to drive traffic to malicious sites.

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=cellular+respiration+in+plants+pdf
    • http://files.sdsusvo.org/uploads/1/3/0/9/130969386/7bda77e30.pdf
    • http://files.bjbeautifulthings.com/uploads/1/3/0/7/130739239/8eed4819aeec3.pdf
    • http://files.worldbizmag.com/uploads/1/3/0/8/130874612/kimekoriv_darajujado_kaxelijatemotix_zojobirujeb.pdf
    • http://toted.yonderway.org/uploads/1/3/1/4/131438405/2812281.pdf
    • http://files.virgiliumidrigan.com/uploads/1/3/1/4/131438013/5775407.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/dikezasanelebudizamivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/wupasusepivemovo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2207/files/wolapogubepenivugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/74868630054.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/systematic_theology_paul_tillich.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/medical_microbiology_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/65980782095.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/82630283041.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/didetilaxupibakozukev.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8772/files/lulaxolemen.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/verologisaguzinowu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3549/0461/files/mufevabufuguvimexev.pdf
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/81661158910.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_off00005f35.bin
25a46c1178a4c114bf53cb329c14fc3841b238e892b76e8b2609b93d4b6ef354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F35 4940 bytes
font_01_sfnt_off0000700e.bin
5c3f996865f826d4c5246d030fcaf2ab31c3b9af4c88cf24ac3af939a9b49d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700E 9740 bytes

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