Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2931bbf4816cb0…

MALICIOUS

PDF

40.3 KB Created: 2020-08-10 07:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13aa0eaf273b2f88b8c8843a8d941f8d SHA-1: efff228e97fdf2347445d8a493d8f24b17922fe7 SHA-256: 8e2931bbf4816cb064c2a2cf88e49b0af36c9eece0fa6ac688b92a87c517238a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. The document body also contains this URL, indicating an attempt to lure the user to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=abiding+in+christ+pdf+andrew+murray
    • http://sotejozaj.reedinstructionaldesign.com/uploads/1/3/2/8/132814930/ce019.pdf
    • http://lowaf.katherinemcmahonart.com/uploads/1/3/2/6/132681352/9951213.pdf
    • http://files.vphstrack.com/uploads/1/3/1/4/131437676/1548042.pdf
    • http://files.oakfurnitureyorkshire.com/uploads/1/3/1/1/131164052/vojesuvijo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/95798503598.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/bewomipiso.pdf
    • https://cdn.shopify.com/s/files/1/0429/2496/6044/files/catholic_mass_readings_2020_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/boxoxubomumarotetutivit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/furimadezirafomoxed.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/modelo_neoliberal_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/pharmacotherapy_casebook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/29949239266.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9121/files/89201878908.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8136/files/guzirojejugomigizomoju.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2775/files/types_of_achievement_test_in_psychology.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_off00005ccd.bin
7edf6cb24c9ba235e0d964584ba16b854279fde4584dd53e680f729e2013cc11
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCD 5860 bytes
font_01_sfnt_off000070ad.bin
112ff91e9458561ccf34dfdfe369853ad52e1cfb9bad98d37403c70a8556ca0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x70AD 10016 bytes