Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d63a27bec0f0af7…

MALICIOUS

PDF

44.9 KB Created: 2020-08-20 06:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1850b5cc7af6ff72b799a9c21cfb4965 SHA-1: a028c10d2f80bfd0a0bccb11e49cb39541d8c812 SHA-256: 7d63a27bec0f0af7ce86f977a5ea48ce11b0e54cd95c41174e49cd246634f8f3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, suggesting an attempt to trick users into downloading an application. The presence of many external PDF links further supports a link farm or SEO poisoning tactic.

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=granny+nullzerp+mod+apk+1.+5
    • http://files.boomingbloomsco.com/uploads/1/3/0/9/130969153/4726265.pdf
    • http://files.bromfield.org/uploads/1/3/0/7/130739490/tubujojodila_samukuri_xufiwozu.pdf
    • http://lifixa.hillsprings.org/uploads/1/3/2/7/132740720/8261269.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/64317043991.pdf
    • https://cdn.shopify.com/s/files/1/0435/8173/5073/files/74593863698.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7125/files/analytical_skills_for_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0444/3999/4534/files/92575556060.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9829/files/31345969825.pdf
    • https://cdn.shopify.com/s/files/1/0444/1836/7654/files/c_form_application.pdf
    • https://cdn.shopify.com/s/files/1/0446/9882/8954/files/68174051706.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/78363495017.pdf
    • https://cdn.shopify.com/s/files/1/0436/4949/9289/files/cdl_self_certification_form_illinois.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/23533233564.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/digestive_system_structure.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/bopuwiwopafiluzujagov.pdf
    • https://cdn.shopify.com/s/files/1/0436/1263/5298/files/26113107163.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_off000065f3.bin
1e0c316ac0d41115ea46526e61aa19d05215a74fd4b5849c82cbad6993b59a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F3 5384 bytes
font_01_sfnt_off0000784b.bin
8383829b43cc03391f0049f8a64f59d146cd9531f099046bc36671fa96081e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784B 15064 bytes

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