Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc5d8b00258143f…

MALICIOUS

PDF

34.4 KB Created: 2020-08-17 14:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7826cfd7d6af0d5561390aeb15ef798 SHA-1: b68661a96abbfc898cace1d687e1a66dfc29509a SHA-256: 3dc5d8b00258143f3f6c8204c5274f46d7f9f903ba6c17c21555817809786622
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous URLs that likely lead to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to a known malicious redirector, ttraff.ru. The ML classifier also strongly indicates maliciousness. The document body contains garbled text but includes the suspicious URL, suggesting an attempt to disguise or obfuscate the malicious intent.

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.ru/pify?keyword=phenyl+chloroformate+sds
    • http://files.winzerfarmcda.com/uploads/1/3/2/6/132696155/ca9d2d.pdf
    • http://files.aprilsandersphd.com/uploads/1/3/1/4/131407705/somoj-pixinodi-jefalazufog.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/counter_strike_2._6_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/joxuka.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/23671393390.pdf
    • https://cdn.shopify.com/s/files/1/0451/4122/9733/files/arunachal_pradesh_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2993/8855/files/sutokarisegogajenazuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/livros_de_acupuntura_auricular.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/catalogo_avon_campagna_17_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/78516005702.pdf
    • https://cdn.shopify.com/s/files/1/0450/2441/1806/files/baricco_iliade.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_off000047aa.bin
8e9bdb2c72337f28835a4a0ed8c678b1965ab6b05eb86ad1f935317ad8f1e63d
pdf-font-stream PDF embedded font (sfnt) at offset 0x47AA 5364 bytes
font_01_sfnt_off000059af.bin
5fa2450e6f0ae9b474fc0ce44176a0924024ef9a260b7d49e67e8f99faf15dab
pdf-font-stream PDF embedded font (sfnt) at offset 0x59AF 10380 bytes