Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6791ff367cab4a…

MALICIOUS

PDF

56.1 KB Created: 2020-08-09 22:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc80a04331da291489b5b24c4bb1b07 SHA-1: bd3aeedabfffdc4ab5546508cfde515b8039b0f7 SHA-256: 1a6791ff367cab4acec61205713df58988aee4f27f5fd2f13768d684e6549c38
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'. The document body, though heavily obfuscated, contains text that appears to be a lure for academic content, further supported by the URL's keyword parameter. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely a user clicking the embedded link, which leads to malicious infrastructure.

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=500+academic+word+list+pdf
    • http://files.runnstitch.com/uploads/1/3/1/6/131637881/4014789.pdf
    • http://files.michaelandsydneylovepi.com/uploads/1/3/1/4/131482953/613ce0fe.pdf
    • http://wenesobo.thinkaboutlibraries.ca/uploads/1/3/1/3/131383483/b3f515e0a881eb.pdf
    • http://files.edutwny.org/uploads/1/3/0/7/130775129/66e02.pdf
    • http://files.chaseburgrodandgun.com/uploads/1/3/0/8/130874025/ce5582.pdf
    • http://files.runnstitch.com/uploads/1/3/1/6/13163
    • https://cdn.shopify.com/s/files/1/0438/4748/3557/files/61756748034.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/72564831090.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/66042488775.pdf
    • https://cdn.shopify.com/s/files/1/0435/2085/2122/files/90490293903.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/installation_camera_ip.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/sepetewovuriti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/bonazudixikelijotole.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/82195107850.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/zeruwivowur.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/87733457880.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/gidejawuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/canary_tokens.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/calculus_made_easy_download.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_off00009859.bin
f42ab7b16237238359fadcd2cbb7beb573dd09c9bd8199b809fbafebe7a38713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9859 5564 bytes
font_01_sfnt_off0000ab42.bin
f322dc44197b8aeef2ea07a8f4af0f75deb0204912d09ba44037d074002fb050		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB42 12496 bytes

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