Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c1659108017644…

MALICIOUS

PDF

46.2 KB Created: 2020-08-30 02:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62b533e5930c02860e8adb3823857db9 SHA-1: a01aa2acb386f599565771322f677b7ba30b8e9d SHA-256: 75c1659108017644e89a39604aee0b2eb7ae44911eb2d9779740db680aee5b12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for phishing. No scripts were extracted, but the embedded links are the primary indicators 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.cc/wix?keyword=3d+nls+health+analyzer+software
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_64ff300321f047068e7aaa263aa18691.pdf
    • https://static.usrfiles.com/ugd/58a813_c4e6cca0e0bd44de9f61df91e5e1a9c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad01e4458ed1442e9f2792d5686f9ff2.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c74718e4fbe434ea351fb67400623f9.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/magefixamovokukerewokekul.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/hernia_hiatal_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/chatbot_aiml.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/55138442914.pdf
    • https://static.usrfiles.com/ugd/12745a_899e4f05040d47cfa97923bcd7b5ed9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bde45607d7d45798d5c14c2ef08990e.pdf
    • https://static.usrfiles.com/ugd/253000_d77fa493d15b4a51a27a6219608aa3dd.pdf
    • https://static.usrfiles.com/ugd/086daf_3ebcba5c69bc45fa8ff909fa94e73170.pdf
    • https://static.usrfiles.com/ugd/b52961_634f76b59aed4646966845bde986660b.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/nebubiwumiwirinerudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/43249547576.pdf
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/20760051345.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007685.bin
e37a09cab302ace63ded00c7335774ceb539160e50a7544c4fb4cac6f18d4d8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7685 5308 bytes
font_01_sfnt_off000088a2.bin
fefb7c0371ae648482d0c2b603e52b1248bde42dcbc54304acbd3a1413743d43
pdf-font-stream PDF embedded font (sfnt) at offset 0x88A2 10376 bytes