Malicious PDF — malware analysis report

Static analysis result for SHA-256 114924bd4d521685…

MALICIOUS

PDF

37.3 KB Created: 2020-09-07 12:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd491af63fec443ad70efa2da236ae62 SHA-1: 7df55df457039789be0cefd5908dc7d127ed6ad6 SHA-256: 114924bd4d521685574cee463421406a414d3c0254402ca0b57ee4b2f9ca1a6c
154 Risk Score

Malware Insights

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

The PDF document contains embedded links designed to redirect users to malicious infrastructure, specifically a URL associated with a ringtone lure. The presence of a large number of external PDF links, many of which are benign, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a campaign to distribute malware or conduct phishing.

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.me/wix?keyword=aashiqui+2+mashup+song+ringtone
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/35f767_cc5f81ddfeae4a5b9c1bcb80f796574a.pdf
    • https://static.usrfiles.com/ugd/2ac701_f51594466fd34149a05bb5f0fe248c7b.pdf
    • https://static.usrfiles.com/ugd/07e02c_d3b028b07afb4cceaf5e4279c941aeb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_39031162c1a244c890e29b41318ea892.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_c46778af7c6e4b2eafe3af14a3be2cac.pdf
    • https://static.usrfiles.com/ugd/d79848_82469822524242cda7ea06685e52b660.pdf
    • https://static.usrfiles.com/ugd/55f640_4f19d9820087415ea199b047a7aad864.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_76a40f747e8345929f739e8144cc2d10.pdf
    • https://static.usrfiles.com/ugd/3794ad_22e4e24982cb4dd5b14edea698d1867f.pdf
    • https://static.usrfiles.com/ugd/70c1f8_36ba0d60ae2e46caa298afed84670ee8.pdf
    • https://static.usrfiles.com/ugd/9bd82e_05203fef94c547dc85f9d4d3395d67a7.pdf
    • https://static.usrfiles.com/ugd/0c268c_c26270b0082c4e4c95b0b9f3aaee561d.pdf
    • https://static.usrfiles.com/ugd/83b1b3_80fc3bbba9154f7abf5901865cb0a4b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2cef5258e2f4b43b3ac8039376843e3.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_off00005172.bin
b5494dd85213eec9249cc8283c8a78c5eb6fcecf686b65c679731bd7bedb89fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5172 5448 bytes
font_01_sfnt_off000063d3.bin
6c786dcb38bb1efeb92058d1ef1e5d57e7a5d0c20f31868738ee4861887fc92c
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 10380 bytes