Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e4e7955f51783f…

MALICIOUS

PDF

43.6 KB Created: 2020-09-02 15:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e936d9dda85c09c7a13887d8074d7203 SHA-1: 8dd64f979cb2c01ac788e9d2cbf74741ae35314a SHA-256: 58e4e7955f51783f811c32f999ba59317d1e46ed64e27b52014decea7641d2e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains this URL and other links to static.usrfiles.com, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves tricking users into clicking the malicious link under the guise of a movie title.

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=3+bahadur+2019+full+movie
    • https://static.usrfiles.com/ugd/b8c837_07f627421c0842cb976ae94f0102d4d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ada7e56737da4eb49f506ffa66f6fcfe.pdf
    • https://static.usrfiles.com/ugd/74a852_fbdd1db19e06430786b68a723808e8d4.pdf
    • https://static.usrfiles.com/ugd/628a76_f7fdca55bb4f48acb6969fcc74d5ee99.pdf
    • https://static.usrfiles.com/ugd/6d59ab_0ac817d6be214ac3ae8ed9e3f09bd28a.pdf
    • https://static.usrfiles.com/ugd/b13fd1_8eb5a51f0d564f3792f8da4abbe3ad4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_039e1768b0b747f9b987de81af01f31d.pdf
    • https://static.usrfiles.com/ugd/b8c837_563bce6c44624919b8f09561690b991b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe8c231f58e4478fa6e538adaf562164.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/twisted_treeline_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6688/files/26189250281.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cec9d0f67f43a7acac605aaaaa5d1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b8f1a4400a3422b8909dc1a4f0ee5ce.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_a8592f40d4124edbb21b2878d2d906e1.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_off00004f94.bin
7f8bc2d3c4a296e71052d9793817b48e6b4a5617029b9909af099aba524930f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F94 5720 bytes
font_01_sfnt_off000062e2.bin
16d668da825b86ff6a08a8bb7555ae2f0554cbf633a0bcfe5e5aa2f48e9f9631
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 10312 bytes
font_02_sfnt_off0000866b.bin
7f21037336c5fbedbf7cbcec8a2cae4d5c7fb71f046fff88765eb129b5e325f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x866B 17196 bytes