Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bc86294d3f3492…

MALICIOUS

PDF

43.3 KB Created: 2020-09-04 02:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b28c8ad364168b0e7dd4220f4f161bc SHA-1: b2ffcf645ddc2f9e502cf9f8877df7c2f94b366e SHA-256: 42bc86294d3f3492a2b5efe0868d70c57a44cec0f572c6e050956203a0ed2759
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.link/pify?keyword=dheeran+chinnamalai+history+in+tamil+pdf`. This link is presented within the document body, disguised as a historical PDF. The presence of numerous other PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.link/pify?keyword=dheeran+chinnamalai+history+in+tamil+pdf
    • https://static.usrfiles.com/ugd/fd30ac_1c5bf55043c74217b7a1bd3d78a5b030.pdf
    • https://static.usrfiles.com/ugd/defdb4_933a2fc58a34400b8b4e570c4b9fc350.pdf
    • https://static.usrfiles.com/ugd/536122_c660698905de40559d4a10e88871acc1.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_8cb3be57e209482cb5ecf7a42b1dec82.pdf
    • https://static.usrfiles.com/ugd/1d64af_e5da80de98e24d418fa3b36738f98c52.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/dafomasobas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/46925902021.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/95827711033.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/46250530541.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5457/files/unconfined_compression_test_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/38250330040.pdf
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/siwalukujavuxoxuvewad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d3e.bin
2530bcfa23b1a7184607547bb8046df06dd217bfd85fe698baf006ee5625bd04
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3E 5496 bytes
font_01_sfnt_off00006fd1.bin
46681c5c4e70df0780b8fc7a8b53c524233b057c5883021305714d2ec3c7598a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD1 3992 bytes
font_02_sfnt_off00007e02.bin
9107501222c961302dde1da1dfd20a967b898350c523c8899602e02519e22f77
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E02 9876 bytes