Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ffef6a2e984c0b…

MALICIOUS

PDF

63.3 KB Created: 2020-08-12 12:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1db5f6dbd429a31e0c8115396ff9b4bf SHA-1: 38cc19077b5c0bd1543c24d015b4f85a384af4a4 SHA-256: 23ffef6a2e984c0b6b2bf4f59d8366788a3c2463ac223aafa96cb087ea585e86
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=les+articles+d%25C3%25A9finis+ind%25C3%25A9finis+et+partitifs+exercices+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on shopify.com domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on the malicious URL embedded within the document.

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=les+articles+d%25C3%25A9finis+ind%25C3%25A9finis+et+partitifs+exercices+pdf
    • http://files.shoptheluxebaby.com/uploads/1/3/0/7/130775506/rovuzeko.pdf
    • http://jixexa.wattafind.com/uploads/1/3/0/8/130874493/satetukewozo_tuxuzoguwe.pdf
    • http://files.artz-rva.com/uploads/1/3/2/7/132740337/3a823353.pdf
    • http://files.louatelier.com/uploads/1/3/0/9/130969465/kupinufaduti-guneb-nutelixijunuwu-lepuma.pdf
    • http://xolipupa.vagelismakris.com/uploads/1/3/1/6/131637016/dabedikonezaj-duzariwer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/adages_and_proverbs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/70533215316.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/sonefebikosabux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/kitchenaid_mixer_attachment_pack.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/72872825836.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/42273737029.pdf
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/savage_arms_shotgun.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9383/files/sufariniriz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/abas_ii_scoring_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/83882465982.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_off0000a287.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA287 2828 bytes
font_01_sfnt_off0000ac81.bin
0d689a9ab528ae891174f2d3a5443cb9dbb030ff0e65981d4b3c7fc42cbe5db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC81 5300 bytes
font_02_sfnt_off0000be54.bin
c203907d7ba5be0928c0f63dec8b512991fee0bef13902f341268595eaf4a60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE54 15712 bytes

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