Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f11549c0a76d38b…

MALICIOUS

PDF

47.0 KB Created: 2020-08-16 20:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a4b6ca749cb5dfa6fc2d987e4dfc801 SHA-1: 7b3b33d172a7fbf7f1ca61265323320dd483bd00 SHA-256: 5f11549c0a76d38bdedb0d9e5246e8a3fbec3034d17fdaec418dc158c524720d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'mens style guide' and a URL that appears to be part of a link farm. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to redirect users to malicious sites.

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=mens+style+guide+spring+2019
    • http://xiwasa.portsmouthacupuncture.org/uploads/1/3/1/6/131636725/lowakijuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1909/8523/files/apollinaire_poesie.pdf
    • https://cdn.shopify.com/s/files/1/0437/4655/8106/files/xonowutavubonozu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/supalosedipisiwoporegur.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/suben.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/fidenin.pdf
    • https://cdn.shopify.com/s/files/1/0438/0255/8621/files/55418226575.pdf
    • https://cdn.shopify.com/s/files/1/0438/6239/2992/files/barreau_de_montreal_formation_continue.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/98548390257.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/gadowivirij.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/78729112284.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/emulsion_polymerization_review.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_off000078ea.bin
506d940bb2da09468d7017d1ac1ce03eb3d6ce2aca40fd6f53d65cbbd06fac1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 5504 bytes
font_01_sfnt_off00008bc4.bin
5d085d99e56be2c97347dc6f1587720208854eeec373a6c1b7b3c310585d9d65
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC4 10524 bytes