Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b79447abc555fa…

MALICIOUS

PDF

37.0 KB Created: 2020-08-01 23:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4688b74944bee535862439f5ca0387d8 SHA-1: beea1e89f49b28ad44de608af4d0398585d6ee11 SHA-256: 17b79447abc555faa0d9a3a2d0f1b21d331ce85b649bd5151ef4ed7df7359b9c
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, though heavily obfuscated, contains the primary malicious URL. This suggests the PDF is designed to act as a link farm or phishing lure, directing users 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.ru/pify?keyword=differential+equations+polking+pdf
    • http://files.rbt247.com/uploads/1/3/1/4/131409526/2374065.pdf
    • http://files.sheplayswithmud.com/uploads/1/3/0/7/130776276/xorunurew_warem.pdf
    • http://files.a1bsolutions.com/uploads/1/3/1/4/131438419/wapuzojozagumi-bidofurafataso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5555796470.pdf
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/85014159865.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/jojuvodajab.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9162/files/49902832474.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6970/files/99049929151.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/54822313369.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/vakukofil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5271/files/43735004914.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/vofutudaxokixoboguza.pdf
    • https://cdn.shopify.com/s/files/1/0435/4660/7784/files/46272223058.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/30077344179.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_off00005220.bin
e0289581ee8085ed8e12b1651ec0293fd1f0869e582cf87819e47d2d216b91ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5220 5400 bytes
font_01_sfnt_off0000648f.bin
6fba3b3d1313b5b82596945739620f366081b8677757b925d917a673ca183f03
pdf-font-stream PDF embedded font (sfnt) at offset 0x648F 10276 bytes