Malicious PDF — malware analysis report

Static analysis result for SHA-256 689af6f006fcb80a…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 04:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54ec22cc22a0fe5f2f7ff73cc5499695 SHA-1: f4476bc46047d8aa0d99d6de6a367a7178dc0c56 SHA-256: 689af6f006fcb80a3c5ebff344d75dd568355110c22b3da92bdf51049ff34b36
162 Risk Score

Malware Insights

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

The PDF contains a lure for a 'PS4 emulator app apk' which redirects to a malicious URL. It also functions as a link farm, hosting numerous other PDF documents, many of which are benign but serve to obscure the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ps4+emulator+app++apk
    • http://zovonijix.vickeldarby.com/uploads/1/3/1/6/131636612/venowasavexasubijo.pdf
    • http://kokero.ndwrestlingclub.com/uploads/1/3/1/3/131379518/e2244b35363.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/2020_calorie_meal_plan_bodybuilding.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/dipidizegivegiximiranu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6799/0438/files/advantages_of_using_technology_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0431/0050/4217/files/archangel_uriel_prayer.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/69888503906.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/fagoxodogewajeziron.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/lomumevub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/miverejejotomogaxopubiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/5013/0846/files/distributive_property_algebra_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0462/1556/1370/files/67874922296.pdf
    • https://cdn.shopify.com/s/files/1/0435/0925/2250/files/past_simple_irregular_verbs_practice.pdf
    • https://cdn.shopify.com/s/files/1/0437/3492/5463/files/electronics_multiple_choice_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/rupaxetalisosav.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_off000066b7.bin
71c884475d0fb5e6d88496b346ddb31e6776a861d7acc00a6b82ccf6d1a70c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B7 5120 bytes
font_01_sfnt_off0000780e.bin
eebc3ca19e44ba884c1fb3aeea2e266c6a2269b3b5192b124fd2b91b46f01e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780E 10524 bytes

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