Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd46f84bd0aacf2…

MALICIOUS

PDF

59.0 KB Created: 2020-08-07 23:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ccbfdcfa5d39e3c6832369a62fd9110 SHA-1: 90e21417bb8b00fccb041ec13f6c1be224f7f91b SHA-256: acd46f84bd0aacf2c87d9c6d478149a752ca144308c8a63b86163d93cab34328
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link pointing to 'ttraff.ru', which is flagged as malicious. Additionally, it exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on compromised Shopify domains. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to download further content. The ML classifier strongly indicates maliciousness.

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=current+affairs+january+2020+in+english+pdf
    • http://files.sanmateolimos.com/uploads/1/3/1/3/131383553/612544a.pdf
    • http://mamos.macedonfamilychiropractic.com/uploads/1/3/0/9/130969754/4955529.pdf
    • http://files.tuneduplife.com/uploads/1/3/1/8/131871717/715496.pdf
    • http://files.triaddjservices.com/uploads/1/3/1/8/131871984/c9c655ba22cdd0.pdf
    • http://files.burgesslab.com/uploads/1/3/1/4/131453645/kojipawipuviwa_faninubevara.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/21061915066.pdf
    • https://cdn.shopify.com/s/files/1/0430/1497/9737/files/87276745185.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/92443083068.pdf
    • https://cdn.shopify.com/s/files/1/0432/4471/6199/files/nenebazoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/37640980896.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/mawagube.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/marifurozijuzaledenikegi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21800621301.pdf
    • https://cdn.shopify.com/s/files/1/0433/6448/3240/files/37626327594.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/aditya_hrudayam_slokam_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/jepodigobesobujepedina.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/59238386637.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008320.bin
064e94aef74c8f29f1b6499853404356beacd8e4d7460f15ff1031e3d8180bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8320 5660 bytes
font_01_sfnt_off0000966a.bin
463dbf0f2b04145cfafe06fa24b091ae50acd9ef8c9a905bdff3a5c3eebb46a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x966A 16236 bytes
font_02_sfnt_off0000c8a6.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 16204 bytes

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