Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca187d548cd29f7c…

MALICIOUS

PDF

49.0 KB Created: 2020-08-20 21:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37bb9971b7ad870bdbf277eb04c39ffd SHA-1: caf8c2d82ae54aa74aedd12dd5165d6c5abf8a9d SHA-256: ca187d548cd29f7ce6d80ac6ef6b13ffa86f3311e20358d2c684a5a3eaa6cd71
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a lure about luxury vinyl flooring. The document also contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user into clicking a malicious link within the document.

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=luxury+vinyl+flooring+installation+guide
    • http://dagavovip.portchteatogo.com/uploads/1/3/0/8/130814328/zulonitomazijesipig.pdf
    • http://files.starkeyspoint.com/uploads/1/3/1/4/131452842/4318184.pdf
    • http://siwotoluz.kentactingstudio.co.uk/uploads/1/3/0/8/130873995/lujupivadafud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0441/3367/9256/files/xizaruxekidavimag.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/70062322157.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/62109953922.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19085525902.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/pikonoxureguvexonidojiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8065/files/pawuxodufusidobumulu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/zonaki.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/arm_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/94808464461.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081d9.bin
b8b0920ee3615d219aec0162dd1d9f1649d021f0ff6cf5ca57ea6c9888dab71b
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D9 5248 bytes
font_01_sfnt_off000093d5.bin
54b6614ce65634b87795af583e192be83f5fa4329477ec44edb965640eeb3154
pdf-font-stream PDF embedded font (sfnt) at offset 0x93D5 10304 bytes