Malicious PDF — malware analysis report

Static analysis result for SHA-256 13eb1df4af024c4c…

MALICIOUS

PDF

44.2 KB Created: 2020-08-12 08:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037a37380aab4c2225fba9faecf263fb SHA-1: 8f3fa59d4645ac54e79c49773fb7d0bfccb499da SHA-256: 13eb1df4af024c4ca19373535db86a8475af14e7c851817675bc3bb8e0bb9e73
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to financial services management, likely a lure to entice users to click the malicious link. The presence of numerous external PDF links, many pointing to benign Shopify URLs, suggests a link farm SEO tactic to improve search engine ranking for the malicious redirector.

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=banking+financial+services+management+notes+for+mba+pdf
    • http://kalasi.transformchoosegreatness.com/uploads/1/3/0/7/130775732/4123789.pdf
    • http://files.charpentierteam.com/uploads/1/3/0/8/130874141/3144917.pdf
    • http://lodip.dundasseacadets.com/uploads/1/3/2/6/132682646/635040.pdf
    • http://fumaxi.bottomfeedersthemovie.com/uploads/1/3/2/8/132814930/fd0d1f9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/3703/8494/files/73344071384.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/shakespeare_quotes_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/75525374572.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/rutuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lasuzopaxikabade.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/99300178927.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/mortal_kombat_super_nintendo_moves.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/xetamelegoxopop.pdf
    • https://cdn.shopify.com/s/files/1/0438/9945/3608/files/13351621253.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/14237568143.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8875/files/96315068812.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4951/files/clinical_anatomy_keith_moore.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dda.bin
476ceb1a89a498462cfad1707aaead0c55c3291782429c22479b899ba5b6d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDA 5576 bytes
font_01_sfnt_off000070b0.bin
518e1b7032f8d2f64c90d9606455081efb281e0685b5dcdc78695fee6f2c9f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B0 10128 bytes
font_02_sfnt_off0000935f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x935F 4324 bytes

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