Malicious PDF — malware analysis report

Static analysis result for SHA-256 207cef545037032e…

MALICIOUS

PDF

46.2 KB Created: 2020-08-31 02:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d6a2fd67c72e181aa6b5716f9e6593f SHA-1: 5b87302d1f4fc12e81888bceed4f8b1485b4c54c SHA-256: 207cef545037032e3f9220b84245b764e6e42998fb8fb488efb88e1b43eabfe3
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body, though partially corrupted, contains metadata and a URL that aligns with the redirector heuristic. The presence of a large number of external PDF links further suggests a link farm or SEO poisoning attempt to lure users to malicious sites.

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.cc/wix?keyword=biodata+format+for+marriage+for+boy+in+hindu+pdf
    • https://static.usrfiles.com/ugd/12f4eb_7e144c10f94b4ae3bf116ae95b4027b1.pdf
    • https://static.usrfiles.com/ugd/5438e3_570a55b9b78a4ac99486d14f0c3de5a2.pdf
    • https://static.usrfiles.com/ugd/18f527_6b60bb31716f4cc8b5f04b58e29971e8.pdf
    • https://static.usrfiles.com/ugd/38bf1f_18b7483a23ce429288871bdbba432555.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7785/files/xbox_360_file_explorer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3469/files/38079198020.pdf
    • https://cdn.shopify.com/s/files/1/0432/1473/3480/files/sobevedo.pdf
    • https://static.usrfiles.com/ugd/d78803_ad2d7d99868940849aa9acaad40ea8b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6f038eb6dce4d23bb1f7da16ae09421.pdf
    • https://static.usrfiles.com/ugd/68ec51_be195c8b680e46aabe23140b68cee5d8.pdf
    • https://static.usrfiles.com/ugd/1a89c8_1f841f36a48141dc9bb094771a55a4c0.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/que_es_la_musica_popular.pdf
    • https://cdn.shopify.com/s/files/1/0441/0369/6536/files/79776025702.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/mebulifikerilazix.pdf
    • https://cdn.shopify.com/s/files/1/0437/8417/5773/files/how_to_teach_vocabulary_esl.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_off00007559.bin
0adca646e3e20b219696a31ee27538ae3966514450b367a12c8a23590a95a337
pdf-font-stream PDF embedded font (sfnt) at offset 0x7559 5536 bytes
font_01_sfnt_off00008804.bin
03802f07d1f067908c7fef32e37ff1192966b6a8faf928386cd4115a3d5945ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8804 10736 bytes