Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e43f6a1804bd642…

MALICIOUS

PDF

56.8 KB Created: 2020-08-05 02:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2584d97eb534c55f61156b8ef593eaa2 SHA-1: 63a71ff75ffbaccccd2c72979e1d666e503eebc4 SHA-256: 8e43f6a1804bd642f9390d155032a7a38fa1f3fa33cd2b553742096980666020
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=banking+and+finance+pdf+notes'. This URL is embedded within the document body, suggesting a phishing or social engineering attempt to redirect the user to malicious content. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=banking+and+finance+pdf+notes
    • http://files.thrivingdrs.com/uploads/1/3/1/3/131380745/00ccec.pdf
    • http://files.coventrypl.org/uploads/1/3/2/6/132696077/fegulepadi-jamazobo-guluw-zogexuf.pdf
    • http://files.trifexy.com/uploads/1/3/0/7/130738554/zevat_rugal.pdf
    • http://files.valentinapetrova.org/uploads/1/3/0/8/130813643/tumiw-lanonalenuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/95439184084.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/sims_3_curly_hair.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/56442798389.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/14369230411.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/98166334003.pdf
    • https://cdn.shopify.com/s/files/1/0437/6782/4533/files/legupogoza.pdf
    • https://cdn.shopify.com/s/files/1/0441/3492/4440/files/xexetifofidutusuzesorem.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/beef_o_brady_s_menu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/nazotujujase.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/55134824907.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/uefa_champions_league_fixtures_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4408/files/zowopub.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_off00009774.bin
09e920f920feac5217e3bf2f5bc6d6fe60d33c2055723c832b6a1cbddbf27f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9774 5308 bytes
font_01_sfnt_off0000a9a8.bin
25d9647b47d2927de499dcdd79b42dfcaf5ee3492da92fe6638812abd4bc575a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A8 13892 bytes

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