Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c5715834dd6914…

MALICIOUS

PDF

57.0 KB Created: 2020-08-22 20:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87cfcd7e50dd903b42b84625028787d SHA-1: 6a8c55e2d177b70d8203d605bd0fddb57087a314 SHA-256: 11c5715834dd6914665918ad9756873a79641419f6e6f9b2aa4c842e448e7cee
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 pointing to external PDF files hosted on various domains, including a redirector. This indicates a link farm or SEO manipulation tactic. The presence of a malicious redirector URL suggests an intent to lead users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, possibly to distribute further malware or engage in phishing.

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.com/pify?keyword=tablayout+android+library
    • http://fekapude.goodnews4thecounty.com/uploads/1/3/1/4/131453574/8305936.pdf
    • http://salud.zmagence.com/uploads/1/3/0/7/130738870/xefalujosoxuneb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/fubafidozidofak.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/79664155707.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/72075130319.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/tosibewudegokalo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1609/2828/files/transformers_bumblebee_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2622/6075/files/93398175986.pdf
    • https://cdn.shopify.com/s/files/1/0436/6978/2693/files/gupegoketegixozuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/zogre_flesh_eaters_osrs_quick_guide.pdf
    • https://cdn.shopify.com/s/files/1/0461/8348/1507/files/62511480128.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_off0000934c.bin
19b07950d8cbd25cd93d98de20880c46f8429766c2e906e7dda075bc7537334c
pdf-font-stream PDF embedded font (sfnt) at offset 0x934C 4832 bytes
font_01_sfnt_off0000a3c8.bin
bdf82e439dba99e55d76642d51990f18930e11f29c0e615f5495d52f97c2863b
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C8 16104 bytes