Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb6bea1c7d01b98…

MALICIOUS

PDF

35.7 KB Created: 2020-09-01 01:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 244ec2faf0cd8348d5b0e55d444360ac SHA-1: bb8c41cbf6008256d5148e43f225c7cf51cffc11 SHA-256: acb6bea1c7d01b98fa442b42a2adf292db7112424f27836b73916a790a97e4ac
154 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 'https://ttraff.cc/wix?keyword=avengers+age+of+ultron+telugu+movierulz'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/b8c837_869ea1663a48477aac062d4ac3bcb323.pdf' being the first identified. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to redirect users to malicious sites.

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.cc/wix?keyword=avengers+age+of+ultron+telugu+movierulz
    • https://static.usrfiles.com/ugd/b8c837_869ea1663a48477aac062d4ac3bcb323.pdf
    • https://static.usrfiles.com/ugd/f1d680_95889db1b18d4e0cbc57d4c45934af1d.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_a665c4a498a04e938e560dd4d6daf40a.pdf
    • https://static.usrfiles.com/ugd/8b9728_1fb6aff50fe043969fa1b00dab3a726e.pdf
    • https://static.usrfiles.com/ugd/822ecd_7191c804e3384108bf95ac995e40e11e.pdf
    • https://static.usrfiles.com/ugd/a4d998_ab333f68afee4d78ba4648e83aa3f6a6.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_ce1f63a0b53e453d9e9ddc8ed117974d.pdf
    • https://static.usrfiles.com/ugd/0dd040_b1d2e42745f64805a99320d70e435f4f.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_aef1d6356a8e4e1cb78c1e9aaa1c063c.pdf
    • https://static.usrfiles.com/ugd/99965f_219aeecb798244919822f6517b9bd0e0.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_off00004d1a.bin
65d878e0730bb7160e69aadf5a1cccec9f4fa6a6178dbb367c14656443c9714b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1A 5184 bytes
font_01_sfnt_off00005ec3.bin
ddc0a733de2d896221467912ebced4729750b59a17625679039014413b3801b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC3 10376 bytes

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