Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b865f1c4e8a0100…

MALICIOUS

PDF

49.2 KB Created: 2020-08-14 02:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02c8588a55bb88c62e4bbb243d72827d SHA-1: 347dbfbe81176feed81ec1a80cc8821374b26a09 SHA-256: 6b865f1c4e8a0100ca0784a1211e4bf81643c91e9c59a11e96fc8876b229f146
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=bt+cotton+notes+pdf'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links, but the primary redirector is suspicious. The document body, though heavily obfuscated, also contains 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=bt+cotton+notes+pdf
    • http://files.wellnessthroughadventure.com/uploads/1/3/1/3/131378950/666367.pdf
    • http://files.8bits4ever.com/uploads/1/3/2/8/132814166/ralafipig.pdf
    • http://files.alrabiahtrading.com/uploads/1/3/1/6/131607047/2851c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/83192323253.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/kudaguvumofisiwezuzosuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/82939802836.pdf
    • https://cdn.shopify.com/s/files/1/0435/0210/8836/files/ms_access_vba_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/horton_youkon_sl.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/limiranoretaxalukeratap.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/jonufavorobevotide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/mirogagokujewezubuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/24830859841.pdf
    • https://cdn.shopify.com/s/files/1/0434/8480/7334/files/kalure.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/68487661342.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/59427081754.pdf
    • https://cdn.shopify.com/s/files/1/0435/3936/6047/files/varicella_zoster_tratamiento.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_off00008292.bin
ff6e9c3dbbf99c55a43d167c321b22ff4efbf71f7e9839b1664cf0f82050468c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8292 4860 bytes
font_01_sfnt_off0000932d.bin
34af05626d120803045f20c974593269dd8d9557af57c533512a5912e66069dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x932D 10788 bytes