Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7af178ab7d3aae…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 13:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a716117fd211d63a5e30c035aa05eebd SHA-1: 82aa7b0490b517f21ddc91479d3c9b418b16f23d SHA-256: 7c7af178ab7d3aae893f09522d84268d05e4d430d0a8f4bd41f4842c65dd35a8
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'chemistry chemical bonding worksheet answers', suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=chemistry+chemical+bonding+worksheet+answers
    • https://cdn.shopify.com/s/files/1/0436/4868/0089/files/banalit_du_mal_arendt.pdf
    • https://cdn.shopify.com/s/files/1/0465/0257/6286/files/72257426305.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/42325888314.pdf
    • https://cdn.shopify.com/s/files/1/0459/7468/3815/files/outlook_automatically_pictures_gpo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/10413169149.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/kexuzekuguboxemogonujipo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/gasarirusirosipexezibixi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/niguzi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/levalimusipazosuzus.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/26166475165.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/97573483970.pdf
    • https://static.usrfiles.com/ugd/724fb5_a59ba8e90a514ee09d00dfd087657f94.pdf
    • https://static.usrfiles.com/ugd/ae059d_3b2e249448df4961849cf5c40cc31568.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e81919ca19146a1974ad386649baea3.pdf
    • https://static.usrfiles.com/ugd/16a96a_a9af883b423948a2bc2e09711c0b9339.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_off00005fb0.bin
49b63f4012404395ecd4f244544155eeb8cc360691d1e76a992f1abe335c3053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 5656 bytes
font_01_sfnt_off000072d2.bin
5b93bfc21e7142af016d765dab12b6fee1425565e2af720e32368d921b6f3efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D2 10036 bytes

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