Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1333c15e4ecbf0…

MALICIOUS

PDF

52.5 KB Created: 2020-08-30 17:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e437bb8dd371d62455a80663bb4c6741 SHA-1: ce009c4f021265183ba07e6ec271985c55f246cf SHA-256: ea1333c15e4ecbf05c89bc92085d7fd0212e12459ad12e84cc36ee080323a144
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is https://ttraff.ru/wix?keyword=lunar+chronicles+wiki, which likely serves as a gateway to further malicious content.

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/wix?keyword=lunar+chronicles+wiki
    • https://static.usrfiles.com/ugd/b8c837_f7d6d618e2a84c7f934c853c60df19ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_2feb2f00adbc4d52b2ca40b7817f0849.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b0760ebcf8242cf9a594d4b66f2709a.pdf
    • https://static.usrfiles.com/ugd/b8c837_fde0e5f9ecf94f0f8fa19f126ef7d74a.pdf
    • https://static.usrfiles.com/ugd/b8c837_39819be299b749e4a93c58badf226a85.pdf
    • https://static.usrfiles.com/ugd/b8c837_01b1f4147b24433b9913a6f7bd2d4617.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf657aff94a542339eabca4ba8f2a807.pdf
    • https://static.usrfiles.com/ugd/b8c837_8af242500e944e1386a1ccb6cee31993.pdf
    • https://static.usrfiles.com/ugd/f523c3_80b14314f12549e5a753b736240c9660.pdf
    • https://static.usrfiles.com/ugd/63d3ad_e50ef975506549f7b46db893d553480c.pdf
    • https://static.usrfiles.com/ugd/b8c837_053808e8de0a4b62b6f65f7f8946bbac.pdf
    • https://static.usrfiles.com/ugd/b8c837_9189c0d0b57d498f90bb808ddc05231a.pdf
    • https://static.usrfiles.com/ugd/0a593f_002fddaeb0c04517b644be403c07704f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9025036dbb73489ea427cea1acc51b50.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_off00009225.bin
d3a2f646e5eb3f02388d0bed68f759c713c946bdbcbf203e8660de8b256ef8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9225 4984 bytes
font_01_sfnt_off0000a31e.bin
8a46b04dc643d0463105cb103a9b31c1cf7b7f3cc2209d5a91c0942f9277c1bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA31E 10244 bytes