Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa9892af8e8609c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-13 03:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17d2c97ba2fc52a55e157125ccf55e36 SHA-1: d3eade17b41041d495bd2ec583147b331ff335c8 SHA-256: 6aa9892af8e8609c8b88d0e3ffff0377e70c9e8eaf2d9c64bad7f21d56a34c2d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate SEO traffic. One prominent link redirects to a malicious infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'osteoporosis guidelines pdf' and a URL that appears to be part of the link farm, suggesting a lure to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=osteoporosis+guidelines+pdf
    • http://files.kingdomgraphxx.com/uploads/1/3/1/3/131398102/bb8d5dd0e4e.pdf
    • http://files.kops-keepourparentssafe.com/uploads/1/3/0/7/130775868/bigosevagonej-bivuma-lakosiverowaba-lupefuf.pdf
    • http://files.joyjech.com/uploads/1/3/2/8/132814097/medaliwesife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/lepaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3435/files/zijopigaxazabawelotemo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/jibididavefizinejebo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/15793662354.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/digestive_system_of_human_body_with_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/craftsman_weedwacker_25cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/monikisolusodesapabod.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/entrepreneurship_theory_process_and_practice_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/23103165366.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/va_form_10-_3542.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/81529501204.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/4181100613.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_off00007220.bin
2c57d99c2992e37a7bfa9d8e6331e76ebc3a053cb1e6f6553bab156d74576943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7220 5024 bytes
font_01_sfnt_off0000834f.bin
872bc02be6ef7218955e5670aabbf7485edaa131498f3f3a1a92fd0d3b7623ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834F 10444 bytes

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