Malicious PDF — malware analysis report

Static analysis result for SHA-256 267511277f0fda58…

MALICIOUS

PDF

40.6 KB Created: 2020-08-08 18:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd534e383949c6e3ec52ece2714ab8ec SHA-1: 1ffe00f858af5b4ca30ad5dd0a62eb434e32a35a SHA-256: 267511277f0fda581944f4aa3da4e12cdd2c8ea80d8148eb527016c684114993
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the redirector link is sufficient evidence of 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.cc/pify?keyword=demography+and+social+statistics+pdf
    • http://files.indiajoneseatery.com/uploads/1/3/1/6/131637658/913a6.pdf
    • http://files.shiningbrightstar.co.uk/uploads/1/3/1/3/131381544/fefafojinawege.pdf
    • http://files.slipstreamnewmusic.com/uploads/1/3/1/3/131398308/47031b46ef90d.pdf
    • http://files.grcrowfamily.com/uploads/1/3/1/0/131070190/3426f7e.pdf
    • http://files.shakticircus.co/uploads/1/3/2/6/132695416/3d841e76f813da8.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5419/files/86429399470.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/fisujisiwowov.pdf
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/piwugob.pdf
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/blender_smoothie_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/feseriwolenezojinubevikor.pdf
    • https://cdn.shopify.com/s/files/1/0438/3683/3954/files/accidente_cerebrovascular_isquemico_etiologia.pdf
    • https://cdn.shopify.com/s/files/1/0437/3856/2712/files/73853045143.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/xorozefuwewakaxofifaridos.pdf
    • https://cdn.shopify.com/s/files/1/0435/0548/3942/files/54248270720.pdf
    • https://cdn.shopify.com/s/files/1/0447/8651/6134/files/khng_m_c_file_bng_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/narogejejogutejuxogexub.pdf
    • https://cdn.shopify.com/s/files/1/0432/4750/1474/files/telecharger_catalogue_cuisine_ikea.pdf
    • https://cdn.shopify.com/s/files/1/0438/1379/8050/files/zilunow.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_off0000606d.bin
23aff7143adb22b29c948523ba0ee6ac049285301b95667d08915417dadb7cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606D 5672 bytes
font_01_sfnt_off0000739c.bin
8cb43773c2f8db46e3da48386f6cbf42f018c521e5e6fb2ab6387ec40b965aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739C 9840 bytes

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