Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7fc35034a838b6…

MALICIOUS

PDF

40.2 KB Created: 2020-08-21 19:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 669e6b3390a5222fd728edbc2a488c7b SHA-1: 92d49d4b4d2786faf473c5fbff440a8328c3d66f SHA-256: 4c7fc35034a838b690d3844bf12aa87a69fae82a6bc4a343621e8ae7d9f679fd
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for link farms and SEO poisoning. One critical heuristic identified a link to a known malicious redirector at https://ttraff.com/pify?keyword=animal+cell+labeling+worksheet+answers. The document body, though heavily obfuscated, contains text related to 'animal cell labeling worksheet answers', suggesting a lure to trick users into clicking the malicious link. The presence of many Shopify-hosted PDF links, while some are benign, indicates a broader campaign to distribute malicious content.

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/pify?keyword=animal+cell+labeling+worksheet+answers
    • http://totabob.sanfranciscozen.org/uploads/1/3/0/7/130776485/57d7084a36.pdf
    • http://files.silverdalevillagemarket.co.nz/uploads/1/3/0/8/130873840/7991122.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/55766652178.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6891/files/lekevumunumowaximinapal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5089/2440/files/rinukiravabipawulipeleme.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/tabawanugilukufe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/applied_spectroscopy_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0446/6225/9865/files/chordata_zoology.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/wenowopibabugozanibuza.pdf
    • https://cdn.shopify.com/s/files/1/0437/5743/7080/files/tiridonezewojegow.pdf
    • https://cdn.shopify.com/s/files/1/0448/0784/8096/files/rules_of_active_and_passive_voice_with_examples_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/el_estado_como_agente_economico.pdf
    • https://cdn.shopify.com/s/files/1/0429/9227/1519/files/intel_7260_bluetooth_driver.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_off00005efe.bin
84f2963397d6fedc8ff4ea0e89058fbc08b71d300e89c64a69ea7a615b4c38df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 5496 bytes
font_01_sfnt_off00007189.bin
e99b3ae3fda04e6dfb9f64c04c67368d008ec9560b4664c56b03d7475980ddef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7189 10132 bytes

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