Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e85e7838f5dad8…

MALICIOUS

PDF

52.1 KB Created: 2020-08-21 23:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e016827648fbd161334c13f794f91fa SHA-1: 9e4180731e6f4844e1d75d758b6980d0c49bb202 SHA-256: 62e85e7838f5dad8c03fda593b9bfa90b602c02a73c5c0d596253349a6fee591
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as 'vinyl sheet flooring installation instructions'. This link is part of a larger link farm, suggesting a phishing or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking the malicious URL.

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.com/pify?keyword=vinyl+sheet+flooring+installation+instructions
    • http://wonok.jordanpriceart.co.uk/uploads/1/3/1/0/131070161/bajalazovidivi.pdf
    • http://files.maimaiglass.com/uploads/1/3/2/8/132815365/786e8542cf7d1c.pdf
    • http://lusene.broadreachboatbuilding.com/uploads/1/3/1/4/131408899/zesewizimab_kavebovepisep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6712/9504/files/5466997989.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7207/files/30614063718.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/3955606732.pdf
    • https://cdn.shopify.com/s/files/1/0432/2561/2450/files/21052372035.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/kitolipojej.pdf
    • https://cdn.shopify.com/s/files/1/0450/9591/1577/files/brauhaus_hannover_speisekarte.pdf
    • https://cdn.shopify.com/s/files/1/0441/3105/7816/files/antergos_i686_iso.pdf
    • https://cdn.shopify.com/s/files/1/0438/8959/0427/files/ridadixosezeviwofusatavor.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/1-_99_magic_guide_osrs.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_off00008d18.bin
561c30ec8eb3383b4e11f4a170da394326dfeb8105859c49b81593c848a26087
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D18 5208 bytes
font_01_sfnt_off00009ed2.bin
c4e150c00621f0de0ef64743dbc26a860b77d8c45da85c436483f1dc18d7bfff
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED2 11136 bytes