Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf678b27667aac29…

MALICIOUS

PDF

63.0 KB Created: 2020-08-09 20:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87a50113b4d43ed6d058f770f277143 SHA-1: f3bc495af898bf86f9923fbce2ead59357d4db0c SHA-256: cf678b27667aac29a510d016cb7172afd6b448d8c07068f5702b40a5328d3f45
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL found in the redirector link, suggesting it's the primary lure.

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=organizacion+politica+del+imperio+carolingio+pdf
    • http://files.prepacademysanangelo.com/uploads/1/3/0/7/130775341/pigeguwifevutobo.pdf
    • http://xuzux.garageshapeups.com/uploads/1/3/1/0/131071157/vadojarunaridixo.pdf
    • http://files.sacredghostrecords.com/uploads/1/3/0/8/130874220/1911394.pdf
    • http://files.scottscheetzphotography.com/uploads/1/3/1/4/131407138/8332824.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/adjektivdeklination_bungen_b1_mit_lsungen.pdf
    • https://cdn.shopify.com/s/files/1/0437/0048/6312/files/32150350512.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/51422707201.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/jazoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/vumavufujevupate.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/49574134843.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/61898784453.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/vanoju.pdf
    • https://cdn.shopify.com/s/files/1/0432/8475/8696/files/5583575897.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/36018824279.pdf
    • https://cdn.shopify.com/s/files/1/0428/7732/1379/files/enderman_farm_overworld.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/6200059634.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/tanozemilapirajenusef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13121593915.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_off0000b51f.bin
b5d1b9cbe11de97bd93f0182889cdc244ce4b60e0111e79b833e361819ae11b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 5376 bytes
font_01_sfnt_off0000c75a.bin
ec04950c79b7fe0e5acb55ca39efc493570b7aecea20137743173d0c5984e087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 12040 bytes

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