Malicious PDF — malware analysis report

Static analysis result for SHA-256 69385fe8d1c25edf…

MALICIOUS

PDF

49.9 KB Created: 2020-08-03 22:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ae438224ab7c892c47c124dde454ef3 SHA-1: dc401fdd74ffd4396d15486a64d5cc2ff43ea24b SHA-256: 69385fe8d1c25edf2050b3762d3c2164603ef0848845d557f61cfc3198154a56
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme to lure victims to malicious sites. No scripts were extracted, but the presence of numerous links suggests an attempt to drive traffic to potentially harmful content.

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=bpt+syllabus+2020+pdf
    • http://files.erinrfreeman.com/uploads/1/3/0/7/130775734/jikekeduxuvafebewiga.pdf
    • http://files.elitegolfcartrentals.com/uploads/1/3/1/4/131438759/796446.pdf
    • http://files.thedefinitearticle.org/uploads/1/3/2/3/132303071/neseloko.pdf
    • http://luwaxake.breathelaughlove.com/uploads/1/3/0/7/130739430/jonulajiri-daxakudojeb.pdf
    • http://files.bronxleadershipacademy.org/uploads/1/3/1/4/131452824/c4e5a1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/lisumuloxodewafevav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/nirudinatego.pdf
    • https://cdn.shopify.com/s/files/1/0438/4233/8981/files/79000498629.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/nelovipojuwato.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/wusojijapobobejekoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/sentry_safe_forgot_combination.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/painted_on_my_heart.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/sitajetirevukifinetufajuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/1361/0392/files/38006178381.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_off00007b7c.bin
bcd1afb547b034b7733ec36571bedc82b4bd3cfc6293beb5c4212844d5ed8c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 5504 bytes
font_01_sfnt_off00008e4e.bin
7ae690a2321c4f65f203f25e11ff704cdf4c38d761b7b29e1031a8bda71ebd4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4E 14528 bytes