Malicious PDF — malware analysis report

Static analysis result for SHA-256 031b472949d7c921…

MALICIOUS

PDF

46.1 KB Created: 2020-08-11 00:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ac68c1f280d451b850f039ace2f87b SHA-1: 6063b6115c5677fdcb17fd0245af1f5ee674390f SHA-256: 031b472949d7c9211c1aef7f5cda98d68f87238e4e82f997af08fe9ad353e687
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=airmen+group+y+book+pdf+download. It also features a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded content, though obfuscated, appears to be related to PDF downloads and includes the malicious redirector URL.

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.com/pify?keyword=airmen+group+y+book+pdf+download
    • http://files.turkey-health-tourism.com/uploads/1/3/1/4/131453934/tiwezojida.pdf
    • http://files.teaandtango.com/uploads/1/3/0/7/130738970/xaputow.pdf
    • http://depaluse.zestcleanfloors.com/uploads/1/3/1/1/131164250/80d7af.pdf
    • http://files.christaniehunterart.com/uploads/1/3/0/7/130739081/1138638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/luponib.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/sirasulejusewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/javascript_tutorials_point_full.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/5325892236.pdf
    • https://cdn.shopify.com/s/files/1/0438/6701/3280/files/7_natural_wonders_of_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0438/4073/3341/files/31804646794.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/57673862010.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/rolirejejes.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/artificiality_and_enlightenment_from_sociobiology_to_biosociality.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1233/files/xabef.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/28046195002.pdf
    • https://cdn.shopify.com/s/files/1/0435/4611/6248/files/25167930751.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2207/files/samotirirewuganapisig.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000689d.bin
9f0935b7f591ba90dd7f35fd9ebd536d0c97f91923392930d2c962268e6c5e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689D 5572 bytes
font_01_sfnt_off00007b8a.bin
acec46f2970589e20c5004aa546c395325529691256f83e9b4ec04705d743f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 10024 bytes
font_02_sfnt_off00009e1d.bin
d7a1248cabf161ff78a072bd924b98f1b4e551660f4e151c9433689786990c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1D 2832 bytes

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