Malicious PDF — malware analysis report

Static analysis result for SHA-256 724fa9aa2f438431…

MALICIOUS

PDF

38.8 KB Created: 2020-08-21 02:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce87cc57649fc9381936327a4c6dce74 SHA-1: edd0ea07fbc85591b3799566d4f2d5ebb1a258a8 SHA-256: 724fa9aa2f43843112bd4b74d9fa2e63724fc7fa196be8c24e7794af5a496d14
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=azbox+bravissimo+transformado+iks+2019. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence indicate a malicious intent, likely to lead users to harmful content or exploit them through further redirection.

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.com/pify?keyword=azbox+bravissimo+transformado+iks+2019
    • http://files.birthtalks.com/uploads/1/3/2/3/132302711/5397876.pdf
    • http://gisimo.gethealthyinitiative.org/uploads/1/3/1/4/131437736/8bdee07ead1.pdf
    • http://files.oskfc.net/uploads/1/3/2/6/132695543/3641258.pdf
    • http://bawiwu.elderresourcesofri.com/uploads/1/3/2/8/132814930/1295670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/68182636605.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/61877932564.pdf
    • https://cdn.shopify.com/s/files/1/0437/5075/2417/files/89436702215.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/14097273318.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2211/files/multiplication_table_worksheet_games.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/pibedusuwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/aldington_death_of_a_hero.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2391/files/xutipizemowifefezemit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7030/0065/files/77722687736.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6324/files/fifijipabuvitovomuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/15122890306.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_off00004968.bin
40c511b149df4ee7cd48b9b786de83167e6bc576cb1a0bfff71cc3a3f356c930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4968 5872 bytes
font_01_sfnt_off00005d59.bin
6f8e1151007d884f55234b3158f9ac8603957f0c8e66e5fbed4c3ee99e620268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D59 3788 bytes
font_02_sfnt_off00006bfb.bin
966547c550fd22785cdac772bef775c4a4e5c73d34bc64f7e04faed1911d638e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFB 10384 bytes

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