Malicious PDF — malware analysis report

Static analysis result for SHA-256 6774770f6b0b7c8d…

MALICIOUS

PDF

66.3 KB Created: 2020-07-31 07:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3d185c29e69997f2931b5ac59095c78 SHA-1: df763abc1b4809e6b7d7fe3c12e88e1bf44c75ef SHA-256: 6774770f6b0b7c8d99b74794f0157cef6eb71da1c29beec33252da2896c475da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The presence of multiple external PDF links suggests a link farm, a common tactic for SEO poisoning or directing users to malicious sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=business+growth+definition+pdf
    • http://files.squareonegoodsco.com/uploads/1/3/2/8/132815154/tasawaz.pdf
    • http://files.dndforwomen.com/uploads/1/3/2/7/132710627/xulisaxisilijibovidi.pdf
    • http://files.psi-loveu.com/uploads/1/3/1/8/131856392/xawijasupi_zesugol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9316/4181/files/tozafusiku.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/79200221588.pdf
    • https://cdn.shopify.com/s/files/1/0439/2671/6584/files/84011873204.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/nanorokoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/1245/4560/files/26273824408.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/3528286813.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/42682432685.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/67260986474.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/92477397460.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/fidinumonafepomeraka.pdf
    • https://cdn.shopify.com/s/files/1/0439/1239/6968/files/20166021040.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_off0000c6b6.bin
875edffe6d0c17d0242d55fe80aca519f3409f4068aa0d807a11131757f0f0e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B6 5084 bytes
font_01_sfnt_off0000d80b.bin
7bd8c7841c43423b20b05d16f63ec2f896788ca698207a8e9f9e0994f5df20dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 10452 bytes