Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ddee7b8f475630…

MALICIOUS

PDF

40.7 KB Created: 2020-07-27 12:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 329bde1c6eee2ddfe13083cc407f3b1d SHA-1: 47583765b71ed2dcb0b0507c6bdad22beff0a905 SHA-256: f6ddee7b8f4756305e34639aaa913d748250681affd2409b959009f86dd68507
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for containing a malicious redirector link to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary one pointing to a Shopify domain. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

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=badshah+movie+full+hd+video+song
    • http://files.vigocountycrimevictimassistance.com/uploads/1/3/0/9/130969004/5489179.pdf
    • http://files.sydneysoapmaking.com/uploads/1/3/1/8/131871780/5154212.pdf
    • http://files.hallchristyhouse.com/uploads/1/3/1/4/131406295/f87d329c73a054d.pdf
    • http://files.panisangelicuspress.com/uploads/1/3/1/3/131384018/7094245.pdf
    • http://files.annaafhallstrom.net/uploads/1/3/2/3/132303024/bisipu-depewurowijodo.pdf
    • http://files.hallchristyhouse.com/uploads/1/3/1/4/13
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/93705440154.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/61943457316.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/50420105081.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/fupefitetojexewufiluj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/bojobipavaledetulupajakez.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/77371143793.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0437/1172/5723/files/44361511977.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/buxitugurimumosojepepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/65043566284.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/50755673671.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9194/files/bunodadoxuzitaximo.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_off0000620a.bin
70082ffeb80f6c7eaa0804931d6b860aff2d5abbf231890e5406e4495fa830be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620A 5136 bytes
font_01_sfnt_off00007365.bin
acc0b7a7d2655b837b88255de27b51481a749b57a15861006d9ec1af63e6d992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 10076 bytes

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