Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eed78c9f7f96848…

MALICIOUS

PDF

49.1 KB Created: 2020-10-19 07:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef5938b4fdab13b75c6108a0dc86586 SHA-1: cb95f375471e5d223c572d70fe3c710d50240f9f SHA-256: 9eed78c9f7f96848d4f7e571c9ea6a8cd696424eb65d193bd530d39998b0e9ed
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The ML classifier strongly indicates maliciousness. The primary malicious URL is ttraff.club, which is used in conjunction with a keyword suggesting a lure for a technical document. The document body, though heavily obfuscated, contains the same URL and keyword, reinforcing the social engineering aspect.

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.club/123?keyword=waveguide+filter+design+pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f870bc37b9cc.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8cc2e1ea90a.pdf
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f8c5ac5a4d7d.pdf
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8b0e67566ac.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8893b585b1d.pdf
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f8835423fe4b.pdf
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f8899b8561fc.pdf
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f89c6761c4a8.pdf
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f8cea81d770c.pdf
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f8c771030237.pdf
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/xusimob.pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/wugazewimuxapun.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8806a4b6a57.pdf
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f89101724f64.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8d15758ba95.pdf
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f8bd79fd7979.pdf
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f8cfeac6a37b.pdf
    • https://cdn.shopify.com/s/files/1/0497/2691/4740/files/rirakoputikodinemure.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/rilalusesomuwin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/jidebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/21457198346.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/77830670617.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_off00008052.bin
2133754beb0f8d0f9536d8947a7ce350e37db3c945468ad951deb5de5b2bbf6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8052 5280 bytes
font_01_sfnt_off00009267.bin
d0e477fd396ce2edae593f7c290dfd7159f2d927027f77f46a1fe574ac53bb97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9267 10696 bytes

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