Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4a88b58f5ef571…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 04:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d201937be69e88878429487ed348bd SHA-1: 885ccb70fbbc89800e9d0835c640470c4902b3bb SHA-256: 2e4a88b58f5ef571577d62711bd997e242efe814b883dbe6b10b502b29383d2c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body also explicitly contains this URL, along with numerous other links to 'static.usrfiles.com', suggesting a link farm designed to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=pee+mak+eng+sub+full+movie+watch+onl
    • https://static.usrfiles.com/ugd/4c1554_548a5733e82b46a782dd959ab81dba18.pdf
    • https://static.usrfiles.com/ugd/b8c837_250c8889548e4b2fb66aed7fd1bd1af5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8333e51fbd040d286aa09d763f6a548.pdf
    • https://static.usrfiles.com/ugd/b8c837_941a267a2d6b460f93fc17b5f551428b.pdf
    • https://static.usrfiles.com/ugd/538d67_c8dba1a3bf8642b3b0404c65bb7c2274.pdf
    • https://static.usrfiles.com/ugd/05900a_6ebd8e22f8fa4516997cf1b5049937a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_8479371d19b44e2cbf5b22b5ffaed65b.pdf
    • https://static.usrfiles.com/ugd/a771bd_f2b43a74c21f4078a483f22598d1bba3.pdf
    • https://static.usrfiles.com/ugd/0047a4_1211b1f23bb44fbe90a9dd3e3e5d0711.pdf
    • https://static.usrfiles.com/ugd/cc14e4_1063f028247c4ec3b899101814e04714.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa28568802844c82bf3acaf25de470f5.pdf
    • https://static.usrfiles.com/ugd/df4650_f5180b554c3c4f59aa4ddf68e9dda24f.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/english_words_meaning_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/32767711062.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/17652525841.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/ralufasiwuzuromawir.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_off0000571d.bin
db52f37f8f5d72d4b9f7a9e61179c0ceb205a5828a555442b72fd2746e5674d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x571D 5556 bytes
font_01_sfnt_off000069eb.bin
e944b675feaaeef7695e8dfeb6fdcd2313612fdb71def2812bc5ac66a355456c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EB 7556 bytes
font_02_sfnt_off00007ebe.bin
7957ebb472c042f49f548f1953e313bfa9192c545d0d9a3ce86563a82d6c2454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBE 12704 bytes

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