Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6b4f71bd203bee…

MALICIOUS

PDF

46.7 KB Created: 2020-09-02 01:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0808912f5f6d1f4e73ecc505f6ce7eb6 SHA-1: d989c6bf5c41b298e2f3c1548223ae5340e0b364 SHA-256: 1f6b4f71bd203bee9197d8444ef375fbf80df2abac3ca409fc22ffa12e311658
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to distribute further malicious content or lead to phishing sites. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. No scripts were extracted from this sample, and the document body was heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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=goodnight+mister+tom+book+report
    • https://static.usrfiles.com/ugd/314c35_c50aaeb63b6b46cc8b661004311b6e9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ebb2b9cc4f49bcb732a2ef894610f3.pdf
    • https://static.usrfiles.com/ugd/32acb1_f8d188cc1d6346a4965dc875dfc1816a.pdf
    • https://static.usrfiles.com/ugd/37428b_4926b1e180124810b40fedb34cf49442.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/roxijubewijukuzupujuvutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/vawupu.pdf
    • https://static.usrfiles.com/ugd/15cd4d_2eadb3a60bc14ef095add01cd34499f6.pdf
    • https://static.usrfiles.com/ugd/4826f5_ee877c7b3f8f4b9f9960659ca37d4bc1.pdf
    • https://static.usrfiles.com/ugd/07625c_b521dc9cce9e4daeb53b699212df5262.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0ec9d01b5224ac2b0db595c21313d7c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3235/4727/files/beethoven_piano_sonata_8.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6317/files/advisory_committee_on_human_radiation_experiments.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_off000070f2.bin
da92d5ba6c2d398be5229b07429de60302864d3761959fa66858e5300ffd62ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F2 5364 bytes
font_01_sfnt_off000082fb.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x82FB 1800 bytes
font_02_sfnt_off00008b89.bin
7fb53beef41cbfdd32a19efc674c3a3d93506cb3225fd9d340933ddf2b9ee2aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B89 10060 bytes