Malicious PDF — malware analysis report

Static analysis result for SHA-256 73946148cfdefc63…

MALICIOUS

PDF

36.1 KB Created: 2020-08-27 17:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40dba036d1c95990bbb77c75a2b429f8 SHA-1: b0c7ade03c748a792b1ff805d9969ec4d34d12e5 SHA-256: 73946148cfdefc633531d1e0dcbead0273121452a7d3b5573a7453ca649e1ede
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO abuse. One of the embedded URLs, https://ttraff.cc/pify?keyword=need+for+speed+payback+skyline, is flagged as a malicious redirector. This suggests the document is designed to drive traffic to malicious sites, likely for phishing or malware distribution.

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.cc/pify?keyword=need+for+speed+payback+skyline
    • http://files.wildmillers.com/uploads/1/3/2/7/132740342/6146705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1571/6516/files/aggiornamento_android_9_pie_samsung.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/punuwefaxanowodekoniz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0142/files/fatal_fury_special_apk_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/rufikaze.pdf
    • https://cdn.shopify.com/s/files/1/0438/4443/6128/files/vekakasukeroturitufa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2008/1563/files/fupakadokiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/1271779651.pdf
    • https://cdn.shopify.com/s/files/1/0427/7318/4678/files/71765524730.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/adding_mixed_fractions_with_unlike_denominators_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9725/files/kineticist_build_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/tupenigexopisigakorafev.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_off00004e3d.bin
4f50499e10bb6690110077d5ded17f5d06513cbb5ec97edf3ce9b792cb5030fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E3D 5424 bytes
font_01_sfnt_off000060c6.bin
9ae5986e5a5d1e9fe9bf16798d7d2f2dd071469f484960b8244a4201ea0caf43
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 10164 bytes