Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bec12f024283d9…

MALICIOUS

PDF

36.6 KB Created: 2020-08-18 18:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a611b9271604a591c9a3037a85adbeba SHA-1: 71273356066e4b86fe75146424224a6f717beeb6 SHA-256: 67bec12f024283d933936a81f43e0bb9a02d53e2daa4376f6108a338e0cba2dc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a pattern indicative of SEO spam or a phishing lure. One critical heuristic identified a link to known malicious redirector infrastructure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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=2016+guidestar+nonprofit+compensation+report+pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/civil_war_timeline_activity.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/tovowaxisaxilurip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/social_media_icons_png_transparent.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/kurixobatisabivotenad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/kexubininotovelof.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/kajojovuvazozufivukujuwam.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/wibesamuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/12701217653.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/83365517860.pdf
    • https://cdn.shopify.com/s/files/1/0437/3928/3608/files/2217434461.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_off00004f61.bin
5b1f3786d6b005581fa7edb0ef1385708e18d63f8a3433d65d9003d435cf6920
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F61 5828 bytes
font_01_sfnt_off00006316.bin
3ae93e6491520a63df6117ea32550c84d02773244b5200397e8c245640cde2eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6316 10072 bytes