Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6ae3de4ef5e0a1…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 01:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231f73f4b950f669e4c65fd04b1893f0 SHA-1: f6d45bc9a7fedae759cd3ee21403718a6918ad4a SHA-256: 4f6ae3de4ef5e0a1f37fba0177da2731f21da2c6c95939ec8551a32aa9deeb6e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised with a movie trailer keyword. It also exhibits characteristics of a link farm, with numerous embedded links to other PDFs hosted on various domains. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector and the link farm structure suggests a campaign aimed at driving traffic to malicious sites, likely for phishing or malware distribution.

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/wix?keyword=kala+chashma+movie+trailer
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/69140515894.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/bezoxodulililodelejezo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6837/2632/files/kz1000_service_manual_download.pdf
    • https://static.usrfiles.com/ugd/c836c3_981da72915fd41df97c2b51f3e661bd7.pdf
    • https://static.usrfiles.com/ugd/99965f_e1da90d76f0d404aa88705e46edee72d.pdf
    • https://static.usrfiles.com/ugd/850f07_2d50e7f9e22d462998d48dc0f4bd7247.pdf
    • https://static.usrfiles.com/ugd/c7a620_0315cee2563e4a0f83995337fd4546a2.pdf
    • https://static.usrfiles.com/ugd/10b11f_c170867763c0402199400a04223d51a0.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/99786843734.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3232/files/namegivine.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/lepagegabirisevel.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/jilopaxegupaseladajadaga.pdf
    • https://cdn.shopify.com/s/files/1/0435/7616/4515/files/albinos_en_africa.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_off00006050.bin
dc23f0bfe8c04304b1e54ea8feb15601e007f0902873ef065682def2cfe59042
pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 5068 bytes
font_01_sfnt_off0000716a.bin
7c083a62d465590853373f37abecf6725df153c5f75e9dbf1e2351c9ba784a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x716A 10328 bytes