Malicious PDF — malware analysis report

Static analysis result for SHA-256 8909849628ad4705…

MALICIOUS

PDF

38.4 KB Created: 2020-08-20 00:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a88e34fd4a61b6ce7e93a39f7d5a54d SHA-1: 2490cc9022d324255fcdbc09f51fc49569fba689 SHA-256: 8909849628ad4705fb05b5239864f8553d7747a489c70b6090bf8017893bee31
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of embedded links, suggesting an attempt to manipulate search engine results or distribute malware. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself points towards a malicious document designed to redirect users to 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=bamboo+daal+ke+naa+songs
    • http://vemilo.keishamorris.com/uploads/1/3/1/4/131407089/e85717db638f.pdf
    • http://files.millvillealumni.org/uploads/1/3/1/3/131384771/bijamufetisem_nilovuxelaxip_lukoxonuf_fujalurigifuli.pdf
    • http://jezumaz.pinkzebracheer.com/uploads/1/3/0/8/130814328/ee11574469f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/8112/5278/files/warframe_fortuna_quest_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/falling_skies_season_3_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0435/7193/7439/files/edexcel_a_level_maths_textbooks_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/battlenet_stuck_at_initializing.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/64544124341.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/calendario_mensile_2020_marbaro.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/ap_calculus_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8399/6063/files/pemanevozasariz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2578/5255/files/83061901662.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/cash_flow_statement_problems_and_solutions_direct_method.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/53657878271.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_off00005551.bin
b6cb3ea4099d2703f3ebd9485f2a481cfabf55abc038d6df2f413b5cef002d97
pdf-font-stream PDF embedded font (sfnt) at offset 0x5551 5304 bytes
font_01_sfnt_off00006745.bin
6caab2745a2c1eea4995ed6412cabe98734166be5b9efd6d65af76342f93ec28
pdf-font-stream PDF embedded font (sfnt) at offset 0x6745 11040 bytes