Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac7436690ef5bb4…

MALICIOUS

PDF

37.0 KB Created: 2020-09-19 09:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bac54e63df977e7ca35b54664dd375f9 SHA-1: 54ccad0665c170117fd24bee6b402cc69880301f SHA-256: aac7436690ef5bb4fb8811c9ea6b4dcf6f81f3cf69ec8b3ae97b31f5b696ed6d
150 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, directing users to 'ttraff.me'. The document body, though heavily obfuscated, contains text related to educational materials and the malicious URL. The presence of numerous embedded links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to increase the visibility of the malicious redirector. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=elementary+number+theory+james+k+strayer+solutions+pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/14237145615.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/seven_wonders_of_the_modern_world.pdf
    • https://cdn.shopify.com/s/files/1/0462/5160/6167/files/sulafu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/array_in_c_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0461/8380/9187/files/prettier_javascript_formatter_vscode.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/40883159531.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/black_friday_hd_movie_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0437/7729/4485/files/quando_nietzsche_chorou.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/gexapizafeximaz.pdf
    • https://2194d55f-04a8-4a91-bef7-9003e3441b98.filesusr.com/ugd/1b7c00_ccc813de6a0242269e60b171ab83196d.pdf?index=true
    • https://769eb2a5-7d5f-4ea4-a2cc-a4c824beb02a.filesusr.com/ugd/74a852_bfa38684fd9e49a09c8448d2fd3b780e.pdf?index=true
    • https://61a7ec34-0e07-4495-a3cf-daaf3207b7e8.filesusr.com/ugd/97aff7_423c3c013e6c43909408b26a4941815d.pdf?index=true
    • https://0dc86028-0416-47d7-b099-0b92589b7079.filesusr.com/ugd/d61b30_b0accda716744ffd922afd3cecf962a2.pdf?index=true
    • 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_off00004ed3.bin
22af17c45c8a5ca4ee7aa91c965e8f81e3e446fef8416272c7fcc3b849a26d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED3 5620 bytes
font_01_sfnt_off000061cc.bin
069e4d803d43f67171152b1122d02ef17f3ee15edc30619c0320de72bf8fb549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 10868 bytes

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