Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef56d680606aef76…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 20:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed0caca06949ea889aa5cae5486427ec SHA-1: 68680cdff5b9bb2be8369fd4be6691c45c98f58f SHA-256: ef56d680606aef76f1332b5a5d3521087dc845092eb2a8f3ef425334bc58c21c
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it is a redirector link to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.cc/wix?keyword=alcatel+versatis+d150+duo, which is likely used to lure victims into a phishing or malware distribution scheme.

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=alcatel+versatis+d150+duo
    • https://static.usrfiles.com/ugd/fac845_099c273f888c492fa6498fa3cb72f5d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_03d0bd130f4f4405a07e7d195c5404c1.pdf
    • https://static.usrfiles.com/ugd/02beb7_25294437d4e84813823976d2d61ff853.pdf
    • https://static.usrfiles.com/ugd/c63dba_4b7042fede8346639e4d060f5ef7b206.pdf
    • https://static.usrfiles.com/ugd/7c30af_3bb5a80a856f4385a347f963b257781e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a49d45e6f349484fb9f3fe2f62c2180a.pdf
    • https://static.usrfiles.com/ugd/fbccce_84f9c44212464757a58cefed1b1a10f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_39819be299b749e4a93c58badf226a85.pdf
    • https://static.usrfiles.com/ugd/b8c837_f23ea85f770646219820833b7fc95e7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffee06910d8b4c089bd896cc3b6c75a7.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/tea_party_guide_fire_emblem_three_houses.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9854/files/kotapeguroze.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/lifowugonovaj.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_off00005bd9.bin
a5629f831cfa95aeb8c9ee621f1e32a8c7f659214a5199f47d08eb4f55aed8d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 5300 bytes
font_01_sfnt_off00006df1.bin
103cfc9e6b2267089cd54f9a357bdd7f122a5ab83757d560647bde207514641a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF1 10560 bytes