Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7ad629881722be…

MALICIOUS

PDF

48.5 KB Created: 2020-08-22 02:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8caee46fd1ce4fc9719a6023f916fa3 SHA-1: f28af44865f3f60175e8ff44c44758a2743c6c03 SHA-256: 7c7ad629881722be5430bfe74f2783200e7fd2110fa2a66dacc8984527a66d31
162 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to malicious redirector infrastructure and is part of a link farm, likely to deceive users into downloading malware. The embedded URL 'https://ttraff.com/pify?keyword=octet+stream+to+pdf+converter' is a primary indicator of this malicious workflow. While no scripts were extracted, the PDF structure and heuristics strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=octet+stream+to+pdf+converter
    • http://files.ferrellsupply.com/uploads/1/3/2/3/132303081/1009050.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/74882433497.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/xadolujobuzuduxepafuselo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/74187527343.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/4456503161.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/zoxozegejusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/23299589317.pdf
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/premedicacion_de_anfotericina_b.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_off00007db9.bin
a7ff69071ab5222b67738df4c0cff97104c743cac8b6c93d6c64c50890ac8669
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB9 5356 bytes
font_01_sfnt_off00008fda.bin
fb182ef6f81b0a2c91f951d4f94f3afb1cdaebc782518098283fabf912c0931a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDA 11064 bytes