Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b51dd025d3db03…

MALICIOUS

PDF

43.4 KB Created: 2020-09-03 04:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a545831d1b106cfad09bc0fdcf99799 SHA-1: 5156238f486f6c9eea5e95a8fa45d78dc72e114f SHA-256: c2b51dd025d3db03b3a1dbcbb0437a78883d0db0ceaf0202a2d80029534a37c8
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as a datasheet. The document body, though heavily obfuscated, contains the URL and references to 'Nema17 stepper motor datasheet' and 'wkhtmltopdf', suggesting a lure. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a potential link farm or SEO poisoning tactic to increase visibility of the malicious URL.

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.club/wix?keyword=nema17+stepper+motor+datasheet
    • https://static.usrfiles.com/ugd/738632_7ba6f1d6390b4579b798da7a937cdaee.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8cec578f8b942bfbaceeef63fab3667.pdf
    • https://static.usrfiles.com/ugd/b8c837_75af4c98b558483ab5b7d42cc283ab75.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3d5b5938c44d1b04ac96dc5199399.pdf
    • https://static.usrfiles.com/ugd/99a8f2_fdd2f993bd3d4f28841ec70149a55b88.pdf
    • https://cdn.shopify.com/s/files/1/0459/9817/8463/files/zakifazajisutetukijop.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/ruxexipomunibaxajid.pdf
    • https://cdn.shopify.com/s/files/1/0434/6245/9544/files/kariseritatejekuluwidetiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/aptitude_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9408/8611/files/adaalat_episode_180.pdf
    • https://cdn.shopify.com/s/files/1/0434/6950/4662/files/26101325839.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/new_proficiency_gold_coursebook_answers_unit_3.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/3214682834.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/zosidabususatotibir.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_off000061bb.bin
2376d23566621d55e961556db42bde120e51983c0d372d4e0ad507c804fe387e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BB 5268 bytes
font_01_sfnt_off00007382.bin
89b493eeb724d7403a90d47dd3d8d629e75347510297bf88cae29865b55955c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 14784 bytes

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