Malicious PDF — malware analysis report

Static analysis result for SHA-256 679eb0e31009d4cd…

MALICIOUS

PDF

52.1 KB Created: 2020-08-19 09:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7387f9a497da0ba915b651ec5af5243 SHA-1: f36a7fbf7c64dce0ca1136d6f92e719d6e201976 SHA-256: 679eb0e31009d4cda683c6182f06246f45711929a7a9fb963b2a0a8a9711ed23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body and embedded links suggest an attempt to direct users to external, potentially malicious, content. The ML classifier also strongly indicated maliciousness.

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=item+guide+tft+lol
    • http://nidati.gilliardandcompany.org/uploads/1/3/1/4/131407511/movuw.pdf
    • http://vazajudip.mybnponline.com/uploads/1/3/2/6/132682883/mopebu.pdf
    • http://files.fastandfrenchexpress.com/uploads/1/3/0/8/130814009/451603.pdf
    • http://neganevo.appleseedsquares.com/uploads/1/3/1/4/131482975/gigasofekuten_faven_vijalade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6524/3813/files/94142013003.pdf
    • https://cdn.shopify.com/s/files/1/0437/3394/2426/files/wopepumobuzir.pdf
    • https://cdn.shopify.com/s/files/1/0428/8852/8035/files/ivy_tech_ivy_learn.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/edit_documents_freeware.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/avatharam_video_songs_hd.pdf
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/mijivotoromaxe.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/wizixofesiraxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48695811849.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/astronomical_coordinate_systems.pdf
    • https://cdn.shopify.com/s/files/1/0439/6836/4702/files/47516094303.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088e0.bin
c3fba4a63d8ae4f3401e62c9c4d8f50b670ea8b9e411c1f1e22d4d00685190dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x88E0 4680 bytes
font_01_sfnt_off000098c3.bin
0ef0c54c78f7a7b78ae1b1d7b4b197bd0e34ba9dd18f781a5e9d3bf30e5357b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x98C3 14296 bytes