Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5b45ae2fada7d6…

MALICIOUS

PDF

57.6 KB Created: 2020-08-08 08:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2c58b1fedb4c55c7e00960e618b38ee SHA-1: d6614eca0f0f579f4b171bdd6c2f58ea8fd669d3 SHA-256: 4d5b45ae2fada7d6171a2c611a6e05563e63db6dc7d6134eec3222934334873f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by an ML classifier and contains a link farm with numerous external links, including one to a known malicious redirector service (ttraff.com). The primary purpose appears to be to lure users into clicking these links, potentially leading to further malicious content or exploitation. No scripts were extracted, and the document body was heavily obfuscated.

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=herbalife+ackman+pdf
    • http://files.grahamcoatman.org/uploads/1/3/1/6/131607310/nuraduxul.pdf
    • http://files.gracecommunitychurchchesapeake.com/uploads/1/3/2/7/132740836/zerivilukezipu.pdf
    • http://files.natjonesartist.com/uploads/1/3/1/4/131406843/lagubikuz.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/afka_soomaaliga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/8238355537.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/17377093654.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/xudaxifetutinixuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2644/0607/files/tivesefaxagezojore.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9516/files/24843280511.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/agilent_1260_infinity_hplc.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/tofarewikikamuzevesapes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/qualitative_data_analysis_with_nvivo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4518/files/overhead_door_legacy_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/berovoren.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.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_off0000a384.bin
241a1175bf3491a5f176cd93c3ad229cb9871469bd20999f3ed9de841b2c284d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA384 5288 bytes
font_01_sfnt_off0000b563.bin
dc6d12c0ca80aa67d104c237d44d1a049bdcf2b515a1d784ac7f7267f2de3f15
pdf-font-stream PDF embedded font (sfnt) at offset 0xB563 10548 bytes