Malicious PDF — malware analysis report

Static analysis result for SHA-256 0981d51a345c8453…

MALICIOUS

PDF

48.5 KB Created: 2020-08-05 16:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b794fc903f8272e47f6e0fd09ca150 SHA-1: 46185c2d5e30c986660b04459102ae512bbfaab4 SHA-256: 0981d51a345c8453b80da4083d8c181553392889ea17ec7d2d8fc504c5985420
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs. This suggests the primary goal is to redirect the user to malicious infrastructure.

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=alcestis+bangla+pdf
    • http://files.keithouyeknives.com/uploads/1/3/0/9/130969260/dawonowilawubasizofi.pdf
    • http://files.montreuxatfc.com/uploads/1/3/2/6/132681698/6c94437a6a26afe.pdf
    • http://files.tonibragg.com/uploads/1/3/1/4/131453485/vixokozurep.pdf
    • http://files.northstatekleekai.com/uploads/1/3/2/7/132740498/merogef_mitijiraxe_fezav_vaxojebof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/97920541555.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2443/files/20809439624.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/72690823120.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1447/files/www_puffgames_come.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/13358529398.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/dikifowaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/wewevijowusoxeremuzapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/kigejezumoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/bivobefumukatifatepel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rofimoluxita.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/vapafesafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/xusetudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/mamiresogotuzomedodave.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/zovozitup.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_off00006ee6.bin
750d6ca8f8fe9a54a28df014f7ccfd2e6cd2fd3429aea12647cf7982cf4bc784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE6 5036 bytes
font_01_sfnt_off00008005.bin
255d989dbabec616d68757a02688232a73f63e3aea92130415522095a4958004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8005 11452 bytes
font_02_sfnt_off0000a6c6.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C6 4324 bytes

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