Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66f3d3ab8fbf578…

MALICIOUS

PDF

42.1 KB Created: 2020-08-21 23:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c784949b36d624fd0a9f0c163ef8e0ee SHA-1: 845c6385248e95e146dcd2f880894b5e946303e2 SHA-256: b66f3d3ab8fbf5781abbe060a27b078e216ca0f7a29523751309d5184f208b84
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=bowmaster+mod+apk+unlocked+all+latest+version'. This link is presented within the document body, disguised as a lure for a modded application. The file also exhibits a PDF link farm heuristic, indicating it contains numerous external links, many of which are to benign Shopify URLs but also includes several unknown URLs that could be part of the malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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=bowmaster+mod+apk+unlocked+all+latest+version
    • http://files.empoweraction.net/uploads/1/3/1/3/131397973/bejodeserifugidi.pdf
    • http://lopenodin.simplymassagebexley.com/uploads/1/3/0/7/130739564/ropozaletil.pdf
    • http://files.camillecharlyart.com/uploads/1/3/0/7/130740141/wubarofikedebop.pdf
    • http://files.fedordokshin.org/uploads/1/3/1/6/131636903/5222020.pdf
    • http://segar.k2physiotherapy.ca/uploads/1/3/0/7/130776783/jaxosos-giwasaleg.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/anaphylaxis_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/20422359951.pdf
    • https://cdn.shopify.com/s/files/1/0435/1534/7103/files/factoring_practice_algebra_2_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/xonasizimaxuxifodalewa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/gafinubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5854/files/pidafo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4499/3181/files/eclipse_32_bit_for_selenium.pdf
    • https://cdn.shopify.com/s/files/1/0435/8668/3037/files/36810751682.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/22472779187.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/9009457082.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062c8.bin
26945506f5dcabfa801f895e2c10e2ea927fb2210d26e535d659d0747b14dcf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 5484 bytes
font_01_sfnt_off0000756a.bin
4d3c891fa16902a8684e5722c8a3739487d0044c9dbf52d2076d041c516a9ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756A 12008 bytes

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