Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad6f8e61d443161…

MALICIOUS

PDF

31.5 KB Created: 2020-08-20 14:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1313ec67e9388cd98ddb080713189b SHA-1: f7edc1e24630988fca4545ae9b256e20e95c24b0 SHA-256: 5ad6f8e61d4431615db7724dc81db3d7fe58f341070cd0b816d0d09b5520652b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many pointing to Shopify-hosted PDFs. The primary malicious intent appears to be redirecting users through potentially harmful URLs, possibly for SEO manipulation or to serve further malicious content.

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.ru/pify?keyword=birdland+weather+report+chords
    • http://files.belab-eurachem2016.com/uploads/1/3/2/6/132696015/jipekemuzenev_zakikuzosusup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7162/5634/files/vinizude.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/xukoseze.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/selebesikaja.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/ffxiv_buying_a_house.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/rockface_tv_series.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/19352638258.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/exercise_physiology_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2849/files/20676299079.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_off00003ea4.bin
2b2f0d87a1e0f1530f2353bc0a67355bf77afd46379ca40ccd3b9374b6a6fa54
pdf-font-stream PDF embedded font (sfnt) at offset 0x3EA4 5300 bytes
font_01_sfnt_off000050ad.bin
af61663eb0900dc97abbde15264575417abf954d90cb38fb5ca103771e5232a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x50AD 9568 bytes