Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9342987125b7fd1…

MALICIOUS

PDF

57.7 KB Created: 2020-07-22 03:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 140e42b51aff21ecbfcae7b2ad33a07f SHA-1: 1e39300b979f252da1ae0a726d99aa9f3ee6934a SHA-256: c9342987125b7fd10e8112a08e18322af8d7461561e487b4642f6fd3e43e714d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'pdf historia clinica psicologica'. The presence of numerous external links, including to Shopify domains, suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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/wb?keyword=pdf%20historia%20clinica%20psicologica
    • http://files.mondayeveningconcerts.org/uploads/1/3/0/8/130813770/85ee8ac57a711c5.pdf
    • http://files.casa-collective.com/uploads/1/3/2/3/132302913/rabepakesimeg_petawagalusep.pdf
    • http://files.lightinyouyoga.com/uploads/1/3/0/8/130814234/palidoguge.pdf
    • http://files.superminiatures.net/uploads/1/3/0/8/130873822/xarebu.pdf
    • http://files.foresightencyclopedia.com/uploads/1/3/1/4/131437504/pexefukigazidiwoj.pdf
    • http://files.lightinyouyoga.com/uploads/1/3/0/8/130814
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/88917566528.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/36644942438.pdf
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/43468020715.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/sixokefoviwasagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/dipuron.pdf
    • https://vavejesa.files.wordpress.com/2020/06/pilajonapi.pdf
    • https://vopamiwo.files.wordpress.com/2020/07/vimoxiluxikozifabozuzome.pdf
    • https://pifajatomib.files.wordpress.com/2020/07/gogetisodiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9730/8840/files/17224473083.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/42701931058.pdf
    • https://cdn.shopify.com/s/files/1/0428/9927/5935/files/89118027440.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sivuduveserekolagaxabulux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/norigej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/kirixibidenoluxebiwuvigu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f60.bin
719a2d01b11d3f07cab1f5703b825ce5708e3c2cbf03fef0d8aa1535b2477855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F60 5088 bytes
font_01_sfnt_off0000b092.bin
89f387ebcabb8182fdfdf89d46eb04664f58e55ec6d9036c56fc5709b4b3e11c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 12336 bytes

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