Malicious PDF — malware analysis report

Static analysis result for SHA-256 add11b49faba9a6d…

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 00:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deceb463a35625d47e140fe12419856b SHA-1: 8e77a2aa61f6667ee81e7a44808b2f6aef44cbe4 SHA-256: add11b49faba9a6d94b85abd3760e35cbb6ec4fff4c339c404606f6f6ad5a941
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but includes the URL 'https://ttraff.cc/wix?keyword=bedford+book+of+genres+online', which is also listed as a malicious redirector. The presence of a link farm further suggests malicious intent, likely to drive traffic to malicious sites.

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/wix?keyword=bedford+book+of+genres+online
    • https://static.usrfiles.com/ugd/e2c250_6c94aa3b33b345ffade278bda3cfa37c.pdf
    • https://static.usrfiles.com/ugd/07625c_51901b8fbdd642d29168ed95904d2173.pdf
    • https://static.usrfiles.com/ugd/9219f8_02f66d12e10440799012008c9ba155dc.pdf
    • https://static.usrfiles.com/ugd/ca300b_45c0a45915244890aafddbb11650d515.pdf
    • https://static.usrfiles.com/ugd/136d07_d19eabe03686434aaa229b62c0366bff.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/2920062998.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/water_supply_and_sanitary_engineering_by_rangwala_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/design_example_of_conventional_activ.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/circulatory_system_worksheet_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/golawuwosukefunugobufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/axiomatic_greg_egan.pdf
    • https://cdn.shopify.com/s/files/1/0461/7633/8073/files/diccionario_biblico_teologico.pdf
    • https://cdn.shopify.com/s/files/1/0430/6868/6497/files/25834799338.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/vujuwulidowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7823/8886/files/calculus_early_transcendentals_7th_edition_solutions_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/6482/5758/files/11165904415.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_off000075c7.bin
3b9f338abc0e0882171ef214940114be1944814d75dd5d1d91598d1e4daa66db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C7 4824 bytes
font_01_sfnt_off00008633.bin
170baae1934272e4ae4455bb7485b0fcb00467ee0fe6c9a567a127924689ec94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8633 10296 bytes
font_02_sfnt_off0000a929.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA929 4324 bytes

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