Malicious PDF — malware analysis report

Static analysis result for SHA-256 072e08e5b8a65cfa…

MALICIOUS

PDF

48.7 KB Created: 2020-08-06 17:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a8401d933fc51dc76e8abe1ce83ca7c SHA-1: f26bf1de276f81ce67f1317c527b600be2057ed0 SHA-256: 072e08e5b8a65cfa02f0010fb039be0ce28106998a3e6517f5a8536ae2a7864a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=probability+random+processes+and+estimation+theory+for+engineers+pdf`. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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=probability+random+processes+and+estimation+theory+for+engineers+pdf
    • http://files.theislamicummah.org/uploads/1/3/1/0/131071067/b5c40c00e.pdf
    • http://maxaw.sustainablemanagement.ca/uploads/1/3/1/0/131069934/karanoraje.pdf
    • http://files.innerstateproductions.com/uploads/1/3/1/0/131070166/179392.pdf
    • http://files.shascotland.org/uploads/1/3/1/3/131383207/0c55f95f.pdf
    • http://files.yogawithdaba.com/uploads/1/3/1/4/131438059/xawir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/24019995666.pdf
    • https://cdn.shopify.com/s/files/1/0428/4134/2108/files/omron_blood_pressure_monitor_manual_bp652.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/49668240937.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6773/files/rivojiluwojuxumuwerilolu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1428/1625/files/xafogore.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/tamowipodedoleb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/tejixadilixug.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/7748541666.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/jajidopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3901/5580/files/gazirusejuwuwivutew.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/94446342921.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/sabupororux.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/xagububijapalijegapim.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_off00007646.bin
7f4a0001ea36362b613218fa2619a7f002ec5390c3f56097f58dd7012223cb89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7646 5812 bytes
font_01_sfnt_off000089ec.bin
275f38d330a5512710d277087301a56d9b6f8078c5747e11b3e54cd81b636275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89EC 13644 bytes

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