Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f227e9e1ddf9c2…

MALICIOUS

PDF

38.1 KB Created: 2020-08-30 01:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4761660e4405b1f1ced74a5f30f899da SHA-1: 2b2a383d57404ef7ee3dbe66522eb5513fa7efeb SHA-256: 75f227e9e1ddf9c2e9d305c3674318cb232c958426e7d28a197227774d05bf2a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a significant portion of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains references to the redirector URL and other URLs that appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the presence of redirector links suggests an attempt to lure users to malicious sites, likely for further exploitation or 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.link/wix?keyword=asce+37+pdf+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2552/8989/files/pdf_to_word_converter_i_love_u.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/38712280823.pdf
    • https://cdn.shopify.com/s/files/1/0428/9124/7779/files/98493460974.pdf
    • https://cdn.shopify.com/s/files/1/0429/1438/1980/files/3506762450.pdf
    • https://static.usrfiles.com/ugd/b8c837_de06e31410784dde8635aea42a71b47c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5275f14275f4be9b28eedb7b2fde6de.pdf
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/the_lion_sleeps_tonight_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/metal_slug_winkawaks_rom.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/84828122280.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/38629821946.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9629/files/86215264785.pdf
    • https://static.usrfiles.com/ugd/e2c250_7110ffeb90ae4398936afca951683c5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ab2735ed65648c4a259943546cac86a.pdf
    • https://static.usrfiles.com/ugd/80c1db_efb6c7a40ccd4bf3812628e3e763cb6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_15d5a2bcce5648acb1eb6306d6485cc6.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_off000057f5.bin
4c3a04f92927c722592743ef8b5f197a10236c2c84fc26b5c02141e9ec1227e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x57F5 5140 bytes
font_01_sfnt_off0000698a.bin
c9f7e766fc927bbfdd73dcb6b9e816670ba73a69ed20b04e05b600cb51018d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x698A 10044 bytes