Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acc740f1aaeb4c6…

MALICIOUS

PDF

55.7 KB Created: 2020-08-08 15:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f22a1a30afb843d24e61154be1441d SHA-1: c413629ace5a972b5f7624263d84de859e41833f SHA-256: 0acc740f1aaeb4c62b08d258b89c0813f55d3b2c389f07fddc894ab2b2517c1b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as book titles, but ultimately redirect to a malicious domain. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The primary malicious URL identified is ttraff.ru, which is likely used for redirection to further malicious content.

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.ru/pify?keyword=biblia+ortodoxa+bartolomeu+anania+pdf
    • http://files.amarilloparties.com/uploads/1/3/1/0/131070992/xotilaj_gakoge.pdf
    • http://files.darlanagel.com/uploads/1/3/1/4/131407106/921393.pdf
    • http://files.stlukeamezionchurch.org/uploads/1/3/1/3/131398428/lozugupufadenijuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/libros_sobre_auditoria_financiera.pdf
    • https://cdn.shopify.com/s/files/1/0435/1364/3167/files/12205481336.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/nuwunorativ.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7717/files/20154110414.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/79249420544.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4136/files/90269098269.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/mabegisapowewuji.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/bekexokadurojutokijunivut.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/kawufazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/34088497592.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/27421872130.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/37881734238.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/basel_3_sbp.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_off00008d12.bin
19fedac873e30626364496610c62789e7173383c61e2c84fca88cf408e7fb0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D12 5148 bytes
font_01_sfnt_off00009e71.bin
f2d204a46cd161d4d6957471b2dc213286db5e2a829230864f79c6a40b1c0698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E71 11004 bytes
font_02_sfnt_off0000c17b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC17B 4324 bytes

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