Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a4ac446d83c144…

MALICIOUS

PDF

49.3 KB Created: 2020-08-07 18:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59b71bb1a0d85c0e7b65deb77ac8f14 SHA-1: 0549e9e096a0dd3731c7a511113f1124ac2bbffc SHA-256: 70a4ac446d83c144a1bb4d94fef4acb8f10375a7c7734fc98d5bb013633bc360
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious payloads. The ML classifier also strongly flagged this PDF as malicious.

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=teorias+causalista+y+finalista+de+la+accion+pdf
    • http://files.europeanfenestrationsystems.com/uploads/1/3/1/3/131379181/2b27e4abdf.pdf
    • http://files.mtnspinweave.org/uploads/1/3/1/4/131453592/e68978dbfb6d4.pdf
    • http://files.hospicemiramichi.com/uploads/1/3/1/1/131164152/3915750.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/96786599494.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/el_cuervo_allan_poe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/bovose.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/st_augustine_confessions_chadwick.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/morisulumamanedozazuvojid.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/lokesanenenomosukikesap.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/86238562247.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/alfabeto_hebreo_moderno.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/lunitu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/87040998943.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_off00007fd4.bin
9445717833ec78a32cebe5b53670eed256cbe59a607e90248f10f2d4c508f6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD4 5200 bytes
font_01_sfnt_off00009199.bin
9995eeb9b131b573a2174a6b58af655dc5597b66bef28afbcb52e2cdefdb6ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9199 11136 bytes