Malicious PDF — malware analysis report

Static analysis result for SHA-256 0341fe9f06975bb8…

MALICIOUS

PDF

43.6 KB Created: 2020-07-31 12:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8519decf3f5869fa577b34789fb9b4e0 SHA-1: 3ac4637ca880c60b5c3f8559421ad966f049ea3a SHA-256: 0341fe9f06975bb86664cf80c74e4b9a7fa73412b84315c5ae5b3ba2877300ad
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the link farm structure strongly suggest an intent to redirect users to harmful content or facilitate further compromise.

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=antiarritmicos+pdf+medigraphic
    • http://files.tenyearsonestep.com/uploads/1/3/1/3/131384071/9815526.pdf
    • http://files.jenateer.org/uploads/1/3/1/0/131070362/sixuvedefudamed-galuwob-zodezex.pdf
    • http://files.abundancewellnesscenter.com/uploads/1/3/1/8/131856195/kuxis.pdf
    • http://files.seancotton.com/uploads/1/3/1/4/131453451/60fdbec51.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/pufozanovuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/34125486302.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/gawonogavarapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2147/5738/files/91135652625.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/72338177004.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/92667636641.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/13059893406.pdf
    • https://cdn.shopify.com/s/files/1/0432/0765/5579/files/gasebob.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_off00006e76.bin
0f637a96e0c939a7daf22a457bf9a2f018616d2687499c2bae0f4b8e655428a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E76 5316 bytes
font_01_sfnt_off0000804d.bin
0730bc1e39d10bd09080dffd1b0ae90452e2443cf2ac8ec86578a4e69fe5f12d
pdf-font-stream PDF embedded font (sfnt) at offset 0x804D 9688 bytes