Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab2f88cd57b77a8…

MALICIOUS

PDF

33.0 KB Created: 2020-08-11 05:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0160b0ef397d1587dcf869871b27a973 SHA-1: 738a2036f120dfbba4b50f4eca8aff19fbb4c960 SHA-256: 7ab2f88cd57b77a8794aae20119611bf931664dd369e70c51e5a947b23205e4b
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 external PDF files, indicating a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.ru/pify?keyword=a+dozen+a+day+pdf+free', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to direct users to 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/pify?keyword=a+dozen+a+day+pdf+free
    • http://files.amurielyoga.com/uploads/1/3/1/8/131856516/dulefene_mubesebekeka_rajasijan_galewir.pdf
    • http://files.glenmccuneart.com/uploads/1/3/0/7/130776745/f4752f42add47cb.pdf
    • http://files.excaliburtravelandtickets.com/uploads/1/3/0/9/130969710/76ef8ed7d6cb3.pdf
    • http://files.drkamiland.ca/uploads/1/3/1/3/131381112/4919357.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/boosting_confidence.pdf
    • https://cdn.shopify.com/s/files/1/0439/3798/8766/files/52795635405.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/32405239610.pdf
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/calendario_con_settimane_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/bosupiku.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/pofiwewiluvamizumoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/68705485636.pdf
    • https://cdn.shopify.com/s/files/1/0428/9521/2697/files/bitadurexozulumuzafuro.pdf
    • https://cdn.shopify.com/s/files/1/0438/9853/6091/files/15993904938.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/47162977872.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/508957232.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/ncdpi_licensure_renewal.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/kipowovujeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0407/files/pathfinder_investigator_guide.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_off0000459f.bin
be39f76413e8c672bd2367349717e6c39c4ac7cb91458c86197edc22b80bcd72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x459F 4964 bytes
font_01_sfnt_off000056a7.bin
5bb487284ebb1201ae1836a0470cc9369668560804dda30ae52f3e5190a88edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A7 9516 bytes

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