Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91d161d39215674…

MALICIOUS

PDF

45.5 KB Created: 2020-08-18 21:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1241406895b00806ef549f7175279a85 SHA-1: 30908ddf773debee6329aff6c26a6186a5e8f5ce SHA-256: c91d161d392156742f9742eed7d3cf6e55b1c190afeda3672ad3a1ed288a53b3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is used in conjunction with a lure for 'Centos 6.5 iso 64 bit free'. Additionally, a large number of links to Shopify-hosted PDFs were detected, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and the document body's deceptive content are sufficient to determine the attack pattern.

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.com/pify?keyword=centos+6.+5+iso+64+bit+free
    • http://serov.rob-warren.com/uploads/1/3/1/0/131070006/vegujamavop-ragaxilus-lireja.pdf
    • http://files.andrzejbojarski.com/uploads/1/3/1/3/131398125/fewozobukexite_warupovisodate_sisidifatidim_kugigegewig.pdf
    • https://cdn.shopify.com/s/files/1/0430/7206/1591/files/81588273296.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/96734245450.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/wow_classic_raptor_egg.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/xubatarejekedotab.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/rumofenazexivanofinadotem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30036161276.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/edward_snowden_permanent_record_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/3852/0997/files/handbook_of_capillary_electrophoresis_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/traumatic_cardiac_arrest.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/37853171810.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/autocratic_leadership_style_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4760/files/systematic_desensitization_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/8125/0469/files/ben_10_reboot_game_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ab.bin
40e4e53b3f4611710a37e570e1b9ad07caeebd2a5f84c4d2c4ae320101e7eaeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AB 4868 bytes
font_01_sfnt_off00007153.bin
217485f40f7032086519b4c9032dcb809d1ec779dbca60b150a3627d924fec7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 13244 bytes
font_02_sfnt_off00009b35.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B35 4324 bytes

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