Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06313222146a632…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e14a28c28e27919a399084467a0aec17 SHA-1: 704b0a49e3613097627323f92d97a0b48147552b SHA-256: a06313222146a6321dc33cf22f82235dc4ab387f89f465b76e7fe67c55065009
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent link directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=the+geologic+time+scale+worksheet+answers+pearson
    • http://files.gfmenvironmental.com/uploads/1/3/1/4/131452949/xesojoxolak_jelafuzese_sarateb_nidop.pdf
    • http://files.labandmasters.org/uploads/1/3/2/6/132682883/sogugoted_befivufenoxufe_filozapefus.pdf
    • http://files.mrsamystaley.com/uploads/1/3/1/4/131438509/5089745.pdf
    • http://files.tokenguitaramps.com/uploads/1/3/2/6/132696483/0ec381ef6eae.pdf
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/break_even_point_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/africa_in_world_history.pdf
    • https://cdn.shopify.com/s/files/1/0440/1286/3638/files/algorithm_complexity_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/burgerking_coupons_oktober_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/77762490031.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/financial_affidavit_short_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/8927/2725/files/low_voltage_circuit_breaker_types.pdf
    • https://cdn.shopify.com/s/files/1/0436/2777/4115/files/inflammatory_bowel_disease_diet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3613/7882/files/32986675832.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_off00006b3d.bin
433e64b000127a64525e3bd4097669101e9a2eec1775f901b407eefc550d1fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 5452 bytes
font_01_sfnt_off00007db9.bin
5e4f47475fbda8deea60bf0eb0f78a9ea19930a3a1bbc0dbe340ca840f0233e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB9 10348 bytes