Malicious PDF — malware analysis report

Static analysis result for SHA-256 019768c199327185…

MALICIOUS

PDF

46.6 KB Created: 2020-08-21 08:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5480ef96d5aa87be984e02742b827c9a SHA-1: 21ce308a9d1327e7a07a69b3b269509433e0bf35 SHA-256: 019768c1993271853f460f5e6c026e832173973848a67257f6c1edd5a941a532
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=twitter+video+and+gif+er+app, which is likely used to lure users to a phishing or scam page. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a link farm or redirection strategy.

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=twitter+video+and+gif+er+app
    • http://xoloju.justpotatoes.co.uk/uploads/1/3/1/6/131637814/decdc6379.pdf
    • http://gulen.erica-barlow.com/uploads/1/3/1/4/131453293/102317.pdf
    • http://files.body-knowledge.com/uploads/1/3/2/6/132681824/2094315.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/xaleto.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/74776686152.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/kivaxipifibunesof.pdf
    • https://cdn.shopify.com/s/files/1/0452/4458/0002/files/pronoun_antecedent_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/15712860798.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/68679532415.pdf
    • https://cdn.shopify.com/s/files/1/0436/7538/6021/files/xovujadesebogexejog.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/zirixokakuvodutitaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/vetekeji.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/tejifuvuwob.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/68369271275.pdf
    • https://twitter.com/PassengersMovie/status/821025484150423557
    • 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_off00006a84.bin
7be5eeaf2cd197b1dcb9fb58a2ddbe8cbb1b955ceae04a6249a21047723abf5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A84 4888 bytes
font_01_sfnt_off00007b47.bin
a8857abaca4e5c4a24d5ae9aef481d2f93c39f0694d7df15347361d80f02118a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 10676 bytes
font_02_sfnt_off00009f89.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F89 4324 bytes

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