Malicious PDF — malware analysis report

Static analysis result for SHA-256 1346472824d88da1…

MALICIOUS

PDF

35.8 KB Created: 2020-08-16 01:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6191940cc8bb5cb2c539a546665de542 SHA-1: 22bc57157fc90d5ab10988820a9d3759486c5dd6 SHA-256: 1346472824d88da1fe63c707dc57471f6d315050900d17d529b2e18f1560799b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=residence%20certificate%20pdf%20telugu'. The document body, though heavily obfuscated, also contains this URL, indicating its likely purpose is to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links and the identified malicious redirector strongly suggest a phishing or redirection attack.

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=residence%20certificate%20pdf%20telugu
    • http://files.rantofaretailer.com/uploads/1/3/1/4/131407635/kufafinodut.pdf
    • http://files.rallytimebar.com/uploads/1/3/0/7/130776131/3128593.pdf
    • http://files.imsarc.net/uploads/1/3/1/1/131164152/59e21829a001871.pdf
    • http://damix.908ent.com/uploads/1/3/1/8/131871864/votavewetojuw-xodolameriti-barewef.pdf
    • http://files.mindfulness-et-sport.com/uploads/1/3/1/3/131383657/5971095.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/60885427622.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/bankersadda_syllogism.pdf
    • https://cdn.shopify.com/s/files/1/0435/1344/6564/files/ralelimajeganex.pdf
    • https://cdn.shopify.com/s/files/1/0458/5426/1401/files/fnma_guidelines_for_mortgage_lates.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/kugofijoraliwadolu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4078/3008/files/larupo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/pepifafugumupebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/the_paper_bag_princess.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/polulixopizekojetabe.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3709/files/akuntansi_adalah.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_off00004fa8.bin
378cf035de762395bd6553e9cd2dc7a0a7919d7eda2cdf7d6656c515360f602d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA8 5328 bytes
font_01_sfnt_off000061cf.bin
da3c6b7282cbe65e71398ad7351dd5bf3b64e973e69ba50c8db92af994039c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CF 9516 bytes

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