Malicious PDF — malware analysis report

Static analysis result for SHA-256 6901c6ba9f08ec58…

MALICIOUS

PDF

47.7 KB Created: 2020-08-11 14:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0396e11a7fcffe0e53db51e76083617 SHA-1: 6a6dac381a1e4644acb769382cdf523ec5a8b05d SHA-256: 6901c6ba9f08ec5889ea14d860637085cd43f93b376736798d9182a4773a9672
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, one of which, https://ttraff.com/pify?keyword=buscopan+injetavel+bula+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick the user into clicking it. The presence of numerous other PDF links further indicates a link farm or SEO poisoning tactic, likely to obscure the malicious intent. No scripts were extracted, but the malicious URL is the primary indicator of compromise.

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.com/pify?keyword=buscopan+injetavel+bula+pdf
    • http://files.aomskw.com/uploads/1/3/1/8/131856071/8269911.pdf
    • http://meribez.cutiepiepampering.com/uploads/1/3/1/3/131378950/komalin.pdf
    • http://gedin.moiraosullivan.com/uploads/1/3/2/6/132682883/gisajabip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/wuvixenanamukuvugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/negolebopine.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/kowixevabedatigokipuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/juzenesigod.pdf
    • https://cdn.shopify.com/s/files/1/0438/7245/2776/files/linear_algebra_hoffman_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6848/files/gumuzujapodadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/96003659147.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/niparugovelew.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9445/files/mamilogakolofofudajafotu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5529/8213/files/77668017815.pdf
    • https://cdn.shopify.com/s/files/1/0430/9113/2577/files/tijedezusimipug.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/kipafunizemuwanoruxaxo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c56.bin
04bdf75d5d3bc681a2589697c7e2398d681cbc9496d8a0bce59c263a93c91c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C56 5380 bytes
font_01_sfnt_off00008eb7.bin
cf1d66f042b068f6a10ef135f9e9dedd715ade995e59a76f0c89f3acc032d892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB7 10568 bytes

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