Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b078fb921e1bf4…

MALICIOUS

PDF

42.9 KB Created: 2020-08-27 23:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1225085c99eb90dd6c05ace972eba662 SHA-1: 3989266b58b100a82d4112a3525734acfd69d898 SHA-256: 52b078fb921e1bf45b6a7122ef975d8382bfd0f8fd76a76c63d54de1dcdbf42a
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to obscure the final malicious destination. The primary malicious IOC is the redirector URL, which likely leads to further malicious 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.cc/pify?keyword=contrapositive+statement+example
    • http://files.elizabethlayton.com/uploads/1/3/1/4/131452982/990706.pdf
    • http://files.mchenrymaltesepuppies.com/uploads/1/3/2/8/132815742/tosejutazigak.pdf
    • http://files.peequality.com/uploads/1/3/0/7/130775350/6029954f8.pdf
    • http://vuvizuruk.lifeinglitter.com/uploads/1/3/0/7/130776525/60c83f7e.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/wefex.pdf
    • https://cdn.shopify.com/s/files/1/0430/4044/0471/files/39469210036.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/asmaul_husna_dan_terjemahan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/nosisizubimafewami.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7159/files/taper_bearing_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0440/0798/1214/files/fuwifafogovolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3851/files/canadian_citizenship_application_form_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/50417438077.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/faxorufagutubalula.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_off0000608b.bin
44c7a2c36c2f591e3f5a13ee12c275840a54c654e7c841b57ab089e1d2662c21
pdf-font-stream PDF embedded font (sfnt) at offset 0x608B 4996 bytes
font_01_sfnt_off00007173.bin
11fb34ff3ca56c228e49bf7ae192f8484be84dc7219ac3adb2f904bddfaf3e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x7173 14804 bytes