Malicious PDF — malware analysis report

Static analysis result for SHA-256 6765bc6b90029443…

MALICIOUS

PDF

36.2 KB Created: 2020-08-08 12:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37ada630f93054d5b379c7d3b58b1b75 SHA-1: 322ba1124f2f3128030495ca9891bd354608f8be SHA-256: 6765bc6b900294430e379f4109d31942f9999b85851357aa820ad01e63c67acd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=anselm+grun+pdf+gratis
    • http://files.oboeandbassooncamp.com/uploads/1/3/1/3/131380895/5621334.pdf
    • http://files.readysetgowebsitedesign.com/uploads/1/3/2/6/132680831/8051818.pdf
    • http://files.millbridgewi.co.uk/uploads/1/3/1/6/131606502/jugajowiboroxiren.pdf
    • http://files.brittgodwin.com/uploads/1/3/0/8/130874566/9f99da81f.pdf
    • http://nudijixuj.stepin2myoffice.com/uploads/1/3/1/4/131437812/40ec4bb997139.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/fakav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/88303178715.pdf
    • https://cdn.shopify.com/s/files/1/0434/4270/0455/files/65890897421.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/53671212642.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/60156733369.pdf
    • https://cdn.shopify.com/s/files/1/0435/0246/9285/files/funoseludakelidovomub.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/batman_o_cavaleiro_das_trevas_hq_edio_definitiva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/tuzakipulupuzelozezidil.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/judemarunapegexixekoresop.pdf
    • https://cdn.shopify.com/s/files/1/0436/1958/2110/files/budokalal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4717/2768/files/64587478995.pdf
    • https://cdn.shopify.com/s/files/1/0433/8106/3838/files/34575309562.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_off00004d07.bin
ecedb89667cdb84a6d228d2368d1f8fe2e3b5a127f68672469b1196890740cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D07 5348 bytes
font_01_sfnt_off00005f1f.bin
cc4d6a5e29995653ea8ec07d1656d176ae151cdd3708a25831f3eeb6f2c53204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1F 11856 bytes

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