Malicious PDF — malware analysis report

Static analysis result for SHA-256 313872489f94744f…

MALICIOUS

PDF

46.1 KB Created: 2020-08-19 17:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 340ea1d17c2224177bbb6dbe3bfe8a1c SHA-1: 267ffdd5fed6176fa65f71da1fd958c1ae215039 SHA-256: 313872489f94744fee4d5e222e02c51411cebd2b19e683877cbcb8db6272b3dc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes a URL that is also present in the embedded links, suggesting a lure for users to click on potentially harmful content. The presence of numerous external PDF links further supports the attack pattern of a link farm designed to distribute malicious content.

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=rolex+ayo+and+teo++audiomack
    • http://files.solidinvestmentgroupbvba.com/uploads/1/3/0/9/130969548/5682264.pdf
    • http://files.swflreview.com/uploads/1/3/1/6/131637211/557188.pdf
    • http://bugaz.eastcoastkubb.com/uploads/1/3/1/3/131383657/d6e567cd7.pdf
    • http://roluk.beyondthegameplan.com/uploads/1/3/2/7/132740900/3170887.pdf
    • http://nepufo.lillyotasevic.ca/uploads/1/3/1/6/131606289/xusak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/gokategob.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/33501893237.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/harry_potter_quiz_and_answers_easy.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/english_aptitude_test_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/31199073730.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/nutaxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9308/files/79082320030.pdf
    • https://cdn.shopify.com/s/files/1/0430/8326/8257/files/32904069959.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/gosomevomodazubinarefajiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/enfermedad_cerebrovascular_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/98399697518.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057f9.bin
64b27198a0f2d943a4e5622fc9a1251d3e424114d9afaddc4fae1fc6745b07dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F9 5052 bytes
font_01_sfnt_off00006928.bin
d1612318e4c9f746b58b6c916da04af76be7c79878c1e884ff5b2d3bfce46c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6928 10296 bytes
font_02_sfnt_off00008c26.bin
1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C26 18776 bytes

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