Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9589e14ea7f7c55…

MALICIOUS

PDF

38.6 KB Created: 2020-08-25 13:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20fb5ded78dc82ebf8f4585d466228b2 SHA-1: 2a8691bacf27b0013511f6eedf1a9a3940d35988 SHA-256: c9589e14ea7f7c55c41bcbf277c8d7682afa4aeb6924db6de61e05b0888f6911
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary malicious redirector pointing to 'https://ttraff.ru/pify?keyword=adobe+reader+10+free++italiano+gratis'. This heuristic firing, combined with the ML classifier's high confidence, indicates a malicious lure. The document body, though partially corrupted, contains text related to 'Adobe reader 10 free italiano gratis', reinforcing the social engineering pretext. The numerous links hosted on Shopify and other domains suggest a link farm designed to obscure the ultimate malicious destination.

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.ru/pify?keyword=adobe+reader+10+free++italiano+gratis
    • http://tirerenin.bowenbirthcollective.com/uploads/1/3/2/7/132712207/sosotebavew.pdf
    • http://files.cda-siemreap.org/uploads/1/3/2/6/132696233/1359016.pdf
    • http://wizizuru.pittsburghrunner.com/uploads/1/3/2/7/132740285/feniv.pdf
    • http://files.stewartblackwood.com/uploads/1/3/1/3/131397946/jozig.pdf
    • http://files.cruiseandtourexperts.com/uploads/1/3/1/0/131070539/9531966.pdf
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/tivezup.pdf
    • https://cdn.shopify.com/s/files/1/0429/3459/9843/files/vugurozebobowepezeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/67859246628.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/51726134183.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3990/files/jufenozadutopuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/wifinowixuvurizejof.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/5663567686.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/27905344714.pdf
    • https://cdn.shopify.com/s/files/1/0429/0635/3823/files/pretest_biochemistry_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0463/2671/0433/files/mezolojifaguboku.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/kevanudukokerumaxobozif.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/diwunipolaxubigu.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_off00005734.bin
ad1eb50fd4857d33e274aece91fd163f6654dbc1cf31edc5f47b3ece99ee4831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5734 5400 bytes
font_01_sfnt_off0000699c.bin
6e052a2256b73997a60acf184872f669b8dc1005e7c6e86df17cecf8348a9382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699C 10532 bytes

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