Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17caf3b52c014ed…

MALICIOUS

PDF

45.4 KB Created: 2020-08-04 03:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af5a997b02c9c4d230ecd25627341ee0 SHA-1: 7f5b9ba9fa197da1c8eee37a5f817da2a8db4e5d SHA-256: a17caf3b52c014eda0f0e37aba4727588067c05d256f214bd9346045063a1a2d
150 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, which points to `https://ttraff.ru/pify?keyword=campbell+biology+in+focus+1st+edition+online+pdf`. This URL is designed to lure users with a search query for a biology textbook, likely as a pretext to deliver a malicious payload. The document also contains a PDF link farm, with many links pointing to shopify.com, but the primary redirector is the most concerning IOC. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=campbell+biology+in+focus+1st+edition+online+pdf
    • http://files.fulbrightinfinland.com/uploads/1/3/2/7/132710763/tolekusepimemex.pdf
    • http://files.oktakemtrading.com/uploads/1/3/2/6/132696351/169d9e8a2a.pdf
    • http://leloxasi.psychedynamic.com/uploads/1/3/1/3/131384401/gizilopozomixew.pdf
    • https://cdn.shopify.com/s/files/1/0448/5742/6081/files/set_up_teams_gen_1_ou.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/88113798263.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/72324735413.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/68092866246.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/saduvubavusawegesage.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/16238277952.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/24090559768.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/98545896439.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/men_in_black_3_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1447/files/timex_ironman_triathlon_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9689/9733/files/nuvos.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/40328301517.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/rewidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/mubewari.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_off000070c6.bin
60dff45ace9bf57ae792876883188192be3ec165eee896e3a98b1492bc91f54f
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 5576 bytes
font_01_sfnt_off000083b8.bin
b559043ab460ad1286eacb5c1a844851beae79cdf5643a0b62d88d5798b6580c
pdf-font-stream PDF embedded font (sfnt) at offset 0x83B8 10904 bytes