Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb2cb13b128ca94…

MALICIOUS

PDF

44.2 KB Created: 2020-08-22 18:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25b28ceb614057e41875ff07885b808e SHA-1: 96ac31b8d43ed1c61c342f0385d6f3473b250861 SHA-256: 6bb2cb13b128ca947ea4e87112d195936b63673ca3686c6c106519ec47e437af
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=background+color+android+studio'. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which point to Shopify domains. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful 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=background+color+android+studio
    • http://files.firstsaturdaypdx.com/uploads/1/3/1/3/131397950/xuwetu.pdf
    • http://files.stacigriesbach.com/uploads/1/3/0/9/130969097/2042345.pdf
    • http://files.michellejohnsonhowell.com/uploads/1/3/1/8/131860378/mupeneretegiko.pdf
    • http://wepusegi.sp-arms.com/uploads/1/3/1/4/131453718/jefojowatinizi_vojifizas_zizawofelilebad.pdf
    • http://files.fctnbombers.com/uploads/1/3/1/0/131070718/d280d9cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2156/5084/files/nesogotesadipitetiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/4393/7690/files/6271291666.pdf
    • https://cdn.shopify.com/s/files/1/0427/9821/9420/files/8097946336.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/actuarial_mathematics_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/wuwamoxujimutukenijadubaz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/79676574172.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8800/files/anonymous_inner_class_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/7352/7203/files/jidefexuxusikiwefenul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.pdf
    • https://cdn.shopify.com/s/files/1/0435/9775/8622/files/alternance_codique_definition.pdf
    • https://cdn.shopify.com/s/files/1/0451/1399/9512/files/possessive_nouns_worksheet_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/sozeduboxebebijezelew.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c86.bin
a600d639f3421e9e38797fd71d2056654857662e15752e12a7a67b3fc554b81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C86 5220 bytes
font_01_sfnt_off00007e53.bin
97dad46530c908185d82a1dd560bc84386e5e181ea0f3d6079acd2f3dfe55332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 11116 bytes

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