Malicious PDF — malware analysis report

Static analysis result for SHA-256 72479d9863697ca5…

MALICIOUS

PDF

42.2 KB Created: 2020-08-06 01:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40f817d9ecebc1cff8b58ac94c913c28 SHA-1: af3d6ad7967e44cbe612b18415ae1d852ee12bff SHA-256: 72479d9863697ca53d9931b05547ad08ef64242f00a4acebe93c425147dd8ef9
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 PDF files hosted on various domains, including a known malicious redirector. The primary link, 'https://ttraff.cc/pify?keyword=probability+math+examples+pdf', is flagged as malicious. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a malicious intent.

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.cc/pify?keyword=probability+math+examples+pdf
    • http://kekosoduz.alexaryzinski.com/uploads/1/3/0/7/130776760/pewewe.pdf
    • http://files.drlindseybeavenmft.com/uploads/1/3/1/4/131438616/gototikige.pdf
    • http://files.guybuncecomposer.co.uk/uploads/1/3/1/4/131406344/vovazodo.pdf
    • http://pibekig.lawlorstudio.com/uploads/1/3/0/8/130874422/xolopedivop-dazesep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/70880906076.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/pozegixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/xuluzepexuvogobubuge.pdf
    • https://cdn.shopify.com/s/files/1/0440/6204/8421/files/bankersadda_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/40802673802.pdf
    • https://cdn.shopify.com/s/files/1/0435/5502/9141/files/bezatubawopiwax.pdf
    • https://cdn.shopify.com/s/files/1/0440/5621/5702/files/superantispyware_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/6294124617.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/luxibakibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8765/1235/files/favupesejuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/52191272892.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_off000066d4.bin
17723f0a04d0810b3c1be96d2bfce4a3572df0044ff2c6088bf2a907a4241e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D4 5592 bytes
font_01_sfnt_off000079ad.bin
d573ea9f43c4722257cf3b413b7bafac79a188f3984306aa42516322742fa273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AD 10108 bytes

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