Malicious PDF — malware analysis report

Static analysis result for SHA-256 72560a04801f7df4…

MALICIOUS

PDF

48.9 KB Created: 2020-08-05 22:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 200b82a7065a74ed90b4fe64721c195e SHA-1: 3ab9030b943bd1d613e5ce0940aaf9f22d8c3d87 SHA-256: 72560a04801f7df40f8fabef6057228ea1f7048b582f19ef2c0c80e4978356be
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, indicating a link farm strategy. One of the primary links directs to a known malicious redirector, ttraff.com, which likely serves as a gateway to further malicious content. The document body itself is heavily obfuscated and contains references to the malicious URL and other PDF files, suggesting an attempt to disguise the 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.com/pify?keyword=alain+soral+pdf
    • http://files.carriedolan.com/uploads/1/3/0/7/130776864/9017134.pdf
    • http://files.learnenglishspelling.com/uploads/1/3/0/7/130739376/0e1b31.pdf
    • http://files.harriscreekpta.com/uploads/1/3/2/6/132680867/2518392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/1501070893.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/mijel.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/48853650903.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/jejumiturutupup.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/past_simple_past_continuous_exercises_multiple_choice.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nofalefupipalivudekim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/57092456896.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/xodowojugilata.pdf
    • https://cdn.shopify.com/s/files/1/0431/5221/2130/files/business_communication_basic_concepts_and_skills.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/68933692135.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_off00008190.bin
c477efd73e3866575d000f9965c3822766029757b35bcf60b4e441e9b9473651
pdf-font-stream PDF embedded font (sfnt) at offset 0x8190 5024 bytes
font_01_sfnt_off000092b6.bin
b490ec08cdecf20c7714ac071880bbb2baae8e98fb5c94aac6c1cf6073952210
pdf-font-stream PDF embedded font (sfnt) at offset 0x92B6 10676 bytes