Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a75513c1f52c7b7…

MALICIOUS

PDF

42.6 KB Created: 2020-08-12 21:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b89c9d1dab89b240a2144312a82a5d4 SHA-1: 150d453c517c0245d874079558eae9e877ceb579 SHA-256: 3a75513c1f52c7b792b312e61d913d0ad8bb3090dedd996b1a32f9c436f4a8a5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious sites. The document body, though heavily obfuscated, contains the target search query and the malicious URL, reinforcing the lure. No scripts were extracted, and the primary malicious activity observed is the redirection to external, potentially harmful, content.

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.ru/wb?keyword=creatinina%20elevada%20causas%20pdf
    • http://files.listerrents.com/uploads/1/3/2/6/132682570/keguguvewuj-woxuv-kiwupajet-jajofusar.pdf
    • http://files.yamagawabudo.com/uploads/1/3/2/7/132740327/c25b80ea0.pdf
    • http://wefimok.southscript.org/uploads/1/3/0/7/130740112/dotijoxutew-piputuf-dutiv.pdf
    • http://files.paultrothqbu.com/uploads/1/3/2/6/132696128/masumibil_fojabiwi_kozatemora_dapose.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tavolotifejenirogamofiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/robotic_arm.pdf
    • https://cdn.shopify.com/s/files/1/0432/4740/3168/files/jibabefi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/zelda_4441_discord.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/74246279563.pdf
    • https://cdn.shopify.com/s/files/1/0431/7773/8399/files/41928636909.pdf
    • https://cdn.shopify.com/s/files/1/0448/1413/9558/files/zemesulizitejum.pdf
    • https://cdn.shopify.com/s/files/1/0440/6676/7013/files/sds_holland_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/banen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/68873209079.pdf
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/bafexuvaxovexitawajipire.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7238/files/xudeludev.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/23936450924.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_off000065e9.bin
3b1edfbedf8f4b1f57126430df2108dd0d47605e4f23a40d7a82f1fbacffa21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E9 5116 bytes
font_01_sfnt_off0000775e.bin
1325a836c02744e5353df408e2a79cdc56d08a1f9eae6e8f2e7ff6e9795f5d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775E 11180 bytes

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