Malicious PDF — malware analysis report

Static analysis result for SHA-256 d527b8a3ef4b559c…

MALICIOUS

PDF

36.5 KB Created: 2020-08-18 20:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eefe07239763ff4fcf3a996b5efea035 SHA-1: e166534608ba003256d43ec60f37f7938230c7a3 SHA-256: d527b8a3ef4b559c6c504a504c34c8b0631682f0ef786ac95a7488ad816239ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=blokada+dns+apkpure', which is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the redirector URL, suggesting it's part of the lure.

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=blokada+dns+apkpure
    • http://files.swartzshowhorses.com/uploads/1/3/1/1/131163613/45de51953ca9.pdf
    • http://files.jacksonanimal.com/uploads/1/3/1/3/131379894/bopuwil_wijiwomojajowid_gugom.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/27016751428.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/american_songbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1895/files/17906788543.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/personal_finance_kapoor_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9704/7718/files/45615242112.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/concrete_slab_construction.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/jevavatin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/baby_crying_ringtone_pagalworld.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005249.bin
c53134241fc426c67493efc588bb714358b9b0b7918d08509dd7e34fa8ac49b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5249 5064 bytes
font_01_sfnt_off0000638d.bin
33ef9f81750fef0717522db6e1e2e0356c55718ad93430e5fcbc78ec83481964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 10000 bytes

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