Malicious PDF — malware analysis report

Static analysis result for SHA-256 e809c3cedb5e2655…

MALICIOUS

PDF

43.5 KB Created: 2020-08-04 16:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5bb16ee2f181943e6cb1f343f3b5ef7 SHA-1: e2a22d1d42cf247fc8658ea3e87eee93918e3b20 SHA-256: e809c3cedb5e2655ee80d5f18b998354ad8369b5e28df878de9665610ee197e2
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=share+capital+audit+procedures+pdf, suggesting a lure related to financial or audit procedures. The presence of numerous external PDF links, many hosted on Shopify, points towards a link farm or SEO manipulation tactic, potentially used to distribute further malicious content or to obscure the true origin of the malicious redirector.

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.cc/pify?keyword=share+capital+audit+procedures+pdf
    • http://files.miciqac.com/uploads/1/3/1/3/131383541/kozita_dizagewogewifa_kapuvisiv_dozodajutukela.pdf
    • http://files.davcal.org/uploads/1/3/0/8/130874058/124d21bc.pdf
    • http://files.estevanwritersgroup.ca/uploads/1/3/1/4/131452870/zowejuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/87247465051.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9180/files/13338323978.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/15581316093.pdf
    • https://cdn.shopify.com/s/files/1/0433/7998/2492/files/budux.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8775/files/zetipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/nifukoniwoxowi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/75305273759.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/warhammer_armies_bretonnia.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/xulupokonovupozukux.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/31237847594.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/sufekiwoliwobimuwidiniz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/72802629805.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/47749122230.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_off00006dcb.bin
c1bc8515e73e79c765fb9c820f5598414379efef77b55f7b9f193dd425245509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCB 5344 bytes
font_01_sfnt_off00007ff0.bin
83fcbf487ab11b538c6930e197c1927fecaf81c5431d2730d9f70729f87dc0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF0 9800 bytes

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