Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19aaed6c086c778…

MALICIOUS

PDF

55.2 KB Created: 2020-11-06 03:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b0e796d3ad1cce5bea7f6e5e9a6ebf SHA-1: 770fe4244d1c132772f69538cf220175c72aa268 SHA-256: f19aaed6c086c77857605929ef97e38e3ccb06dcb7df1de31a467f59c6f302e9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. One prominent URL, https://trafffi.ru/strik?keyword=unblocked+games+66+3+point+shootout, suggests a lure related to online games. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the sheer volume of external links and the ML detection point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?keyword=unblocked+games+66+3+point+shootout
    • https://kejedaxuz.weebly.com/uploads/1/3/4/3/134355680/birunumatubemug.pdf
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/jilunego-funojijipew.pdf
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/d7cfb6f4.pdf
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/vokokilij.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/vigulusudeloku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2f8481b7-0c32-434f-ada3-a964202e77a3/49224086457.pdf
    • https://s3.amazonaws.com/tawosutosuxi/bejikelaragazas.pdf
    • https://uploads.strikinglycdn.com/files/346ef517-78be-4449-a7d0-9a70f58c97ec/musuxuwexunebevo.pdf
    • https://uploads.strikinglycdn.com/files/2b3e4e25-fe98-44ea-9fea-6f23a71671c3/kinasukoj.pdf
    • https://uploads.strikinglycdn.com/files/694f53c4-ec28-4555-ab12-95614059a9cc/65187184498.pdf
    • https://uploads.strikinglycdn.com/files/7398f672-ecde-4bc0-809d-0256355f92b3/cuisinart_digital_air_fryer_toaster_oven_manual.pdf
    • https://uploads.strikinglycdn.com/files/f05a2a5a-e3a6-4688-808b-7551b470515a/sazekanesikadux.pdf
    • https://uploads.strikinglycdn.com/files/0dc8813e-0b31-45cd-980c-82d558bd159c/xuwobarizagil.pdf
    • https://uploads.strikinglycdn.com/files/954550a9-4250-41a8-8441-4836010c6cbd/gituzesupubepu.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_off00009789.bin
ddd173eea88865dffbc69688cd78184d9a729ec221bbd39e5525abbb59284401
pdf-font-stream PDF embedded font (sfnt) at offset 0x9789 5904 bytes
font_01_sfnt_off0000ab7b.bin
76aa1bc8a689d78ec34fc9939e75c673317b5f3a0a9dbff3ae71e33f89dc1be6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7B 10912 bytes