Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1f3639fd133a80…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 17:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19beb4e87a8fa5dc5cd53e36e946bb6b SHA-1: a8a761c4619ee57d048432d38e6610bd1e6dbbdb SHA-256: 5b1f3639fd133a808ce958ccd5492633e9467f8f0b98e66dfdaa92c3386da21b
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the PDF is designed to lure users to malicious websites, likely for phishing or malware distribution.

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=clause+in+english+grammar+exercises+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0462/1303/8233/files/peliculas_de_barbie_completas_en_espaol_lista.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/kenmore_70_series_dryer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/46191936245.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/74155973161.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/somewhere_anywhere_exercises.pdf
    • https://static.usrfiles.com/ugd/599026_772492e7fe384c17bbce7b368381965f.pdf
    • https://static.usrfiles.com/ugd/45e30f_6c151e1c2a084d1781665c28c4089707.pdf
    • https://static.usrfiles.com/ugd/003b86_a3d59acd50ba4ee998d22ca7ec238925.pdf
    • https://static.usrfiles.com/ugd/b8c837_50ac7c30521a474289515246b2c668c0.pdf
    • https://static.usrfiles.com/ugd/ad2ade_7304267b81214e65b2700e3592b91fe9.pdf
    • https://static.usrfiles.com/ugd/9421c8_49e12c89c91b4bb6be280700443b3742.pdf
    • https://static.usrfiles.com/ugd/07e02c_f89d8f46572e44f6b9cb2239f4bcdc9c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/glittering_generalities_example.pdf
    • https://cdn.shopify.com/s/files/1/0436/2010/6404/files/drag_racr_v2.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_off00005ff5.bin
6d88199e42feeb1173ccaff76c2cddb5a0362c18ac236d8127d4bcf3ed5fd774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF5 5168 bytes
font_01_sfnt_off0000716d.bin
26af230813a40836ec7131e93e7d9242150b9ec56829a668d26d2a756b710184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 10284 bytes
font_02_sfnt_off000094a6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A6 4324 bytes

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