Malicious PDF — malware analysis report

Static analysis result for SHA-256 742916ac256dd4ae…

MALICIOUS

PDF

43.1 KB Created: 2020-08-06 19:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79324a6cee86739eb3bbc1914377d8a6 SHA-1: 4d696246bf7cfc2973384f6ee7b4b9f0701a59db SHA-256: 742916ac256dd4ae27338a20804e3cc1b46c0cad675d25efb90fe6613f73d280
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, with the primary URL being a known malicious redirector. The heuristic firings indicate this is a link farm designed to direct users to potentially harmful content. 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.cc/pify?keyword=cards+against+humanity+geek+pack+pdf
    • http://files.brilliantbookclubs.com/uploads/1/3/1/4/131453843/tulupux_lagijov.pdf
    • http://salikazet.tricitiesfire.com/uploads/1/3/1/8/131871745/f8f42.pdf
    • http://files.scholarsmartialarts.com/uploads/1/3/2/6/132680986/9ec373bcfaf06c3.pdf
    • http://tusuxigux.woodblossom.org/uploads/1/3/1/4/131437984/jotinapifaxogor.pdf
    • http://files.treasured-one.com/uploads/1/3/0/8/130813859/xubeziruwefibopila.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/91567327073.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/tumigififo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6067/2165/files/mitejisefufemepuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/vaguxulokowemiligexasapo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/zofanudodudeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3035/5866/files/6511269765.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/kekitevudifulepu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonexosorovofevovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5558/files/tasubedebazekov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004eea.bin
8d97f09e931ea966b3f8a25d6a411fcf9e56f7aa8bda1406fec0bdf761b3dd1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEA 5500 bytes
font_01_sfnt_off0000617c.bin
e2501bb3584633821b1246285d65ddb0724b41ab94fefd6919ce4f90d9d9aa10
pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 14840 bytes
font_02_sfnt_off00009126.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9126 4324 bytes