Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cda78f7d2203d0…

MALICIOUS

PDF

34.1 KB Created: 2020-08-23 11:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb884bf5fc5532997b38a3c08b821990 SHA-1: e5de17f2dcfa0abb8e83e42bb89e49358e819ae8 SHA-256: 99cda78f7d2203d0e8f1dda3f73e0b6ad8b2df0d0fe14561dc47c543467e5dbc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector infrastructure (ttraff.com). Another critical heuristic identified a PDF link farm, with many links pointing to Shopify-hosted PDFs, likely to obscure the malicious redirector or for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm and redirector indicate a likely phishing or scam attempt.

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=boson+exam+sim
    • http://files.heroicproducts.net/uploads/1/3/1/3/131379113/30b2ea1a8b8bc3.pdf
    • http://files.naturalenvironments.net/uploads/1/3/0/7/130738596/512c1f.pdf
    • http://files.centraltexascreation.com/uploads/1/3/0/9/130970003/3df02e.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/78551148341.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/bam_bam_song_dj_remix.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/viwanaboxesoganu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/contract_template_for_marketing_services.pdf
    • https://cdn.shopify.com/s/files/1/0440/8632/9509/files/fugejedufesabudulamib.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/pobore.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/18452518157.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/babuwudeki.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2799/files/lamavivesegibasupuragew.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5934/files/nebuxogelabosimeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3301/files/scientific_experiment_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52733892229.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_off00004920.bin
6c28f80e822d7fb762f6c5b7208f8a522a3730f5c9a18ca8dc413b07c6523ed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4920 4820 bytes
font_01_sfnt_off00005977.bin
54a813b8b1fec4cf0f215022d4d95807f7b69983a5ce7b3d8467b83b9a020d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x5977 10540 bytes