Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ce1fe8d7db3248…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 02:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3a21598753c6462ec27fbc20c349d21 SHA-1: ad84f9dfe120d989d03c979e701d8fe9e67810c2 SHA-256: 89ce1fe8d7db3248fe8657fa10edfd99872f7c8870fbf2ddefbce598949b2d15
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One of these links, https://ttraff.ru/wix?keyword=afghan+hound+puppies+para+venta+en+p, points to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign links.

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/wix?keyword=afghan+hound+puppies+para+venta+en+p
    • https://cdn.shopify.com/s/files/1/0440/4386/2181/files/tuxewigeku.pdf
    • https://cdn.shopify.com/s/files/1/0434/6236/1245/files/expedia_inc_annual_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/easy_afrikaans_stories_to_read.pdf
    • https://cdn.shopify.com/s/files/1/0429/9177/9999/files/edgenuity_literal_equations_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/6810/2558/files/bekaxoge.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/wow_classic_shazzrah_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/18249599678.pdf
    • https://cdn.shopify.com/s/files/1/0434/8254/6341/files/zeleku.pdf
    • https://static.usrfiles.com/ugd/4d935e_9f84dc81e66b492bab64a387ff36464c.pdf
    • https://static.usrfiles.com/ugd/cf14a4_32198db0c25b4de5bcab31a1c6bb7ba4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4583/files/33965351860.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/dragon_city_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/40013907990.pdf
    • https://cdn.shopify.com/s/files/1/0465/1230/8382/files/10990344348.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_off00006021.bin
efde5211b5565698641cfd3b47a94209b5541f96819efc6ede7c2b43410391c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6021 5320 bytes
font_01_sfnt_off0000723f.bin
c2aed36fc343ddaedd5d4b6cd37b884c415f4e2409219b3c3ea4e66bcc7f8d16
pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 10732 bytes