Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d4885c6318309b…

MALICIOUS

PDF

35.7 KB Created: 2020-08-23 07:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d84152d66e13fa1bc21099e7487b0deb SHA-1: 003d54acd69bed690c15238d9034759989c6ac77 SHA-256: 72d4885c6318309b4b77570a27ce246c160f5e62d44e7836d6d9c3e28851df9b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=may+2018+telugu+calendar+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the overall structure points to a spearphishing attachment used to redirect users to malicious infrastructure.

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=may+2018+telugu+calendar+pdf
    • http://kivejo.cunninghamgermanshepherds.com/uploads/1/3/1/4/131437622/wubozidabibi_susep.pdf
    • http://famokugep.ilmbiz.com/uploads/1/3/2/7/132740748/damemuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/foterimumapiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/24968239211.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/gusupobabawo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/pilitibumafuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/19400087155.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/99801637976.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/kezenuwexipixopovese.pdf
    • https://cdn.shopify.com/s/files/1/0436/8505/2566/files/74525587989.pdf
    • https://cdn.shopify.com/s/files/1/0437/0612/2393/files/tuvulus.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9426/files/animated_coming_soon_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/14175657792.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89573664631.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/algebra_1_sol_practice.pdf
    • https://cdn.shopify.com/s/files/1/0439/4650/8456/files/torn_piriformis_treatment.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_off0000499e.bin
680662391f10925d48cb4035bfe983aed01af6fa93b40c3616bec13027b0f5f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x499E 5772 bytes
font_01_sfnt_off00005d61.bin
416f42ca3aea3420de7b99b9a4620e43b45fd294cdc8eafdc61965d60b76327f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D61 11016 bytes

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