Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1c3bef541641cf…

MALICIOUS

PDF

49.9 KB Created: 2020-08-25 18:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5a18c8e06d7513093a4e61ae5f8089 SHA-1: d2fade76969144329c7fe016cdec656d3661676d SHA-256: 0b1c3bef541641cf2517767e3985c6ad0e3a968181eaf7f472caa5b287818673
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'free children's book template PDF' and includes the malicious URL. The presence of many external PDF links further supports a link-farming or redirection-based attack. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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.ru/pify?keyword=free+children%2527s+book+template+pdf
    • http://gunalo.stmarkski.com/uploads/1/3/1/4/131437069/9783580.pdf
    • http://files.sylvialowery.com/uploads/1/3/0/8/130814666/60a0bcda0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5440/6561/files/apostrophe_worksheet_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/3927/6699/files/wasufajomozexowonokelif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/22886975220.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8171/files/best_budget_android_smartwatch_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/sogijasotat.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/26892236932.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/kosumazeka.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/cambridge_primary_mathematics_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/glades_season_5.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_off000084e1.bin
7410e943436388ef44619f71dee07120cadd77bc7483ec7344e078856dc9928f
pdf-font-stream PDF embedded font (sfnt) at offset 0x84E1 5588 bytes
font_01_sfnt_off000097ad.bin
6167d505078d4354fd90bbe746794818e96db3fea045b84dbdf073b50e823508
pdf-font-stream PDF embedded font (sfnt) at offset 0x97AD 10244 bytes