Malicious PDF — malware analysis report

Static analysis result for SHA-256 881531155d4902cf…

MALICIOUS

PDF

46.4 KB Created: 2020-08-27 15:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cf197d7b6508f0983eb9d75a48e8599 SHA-1: b5ead6bc7f2b92959d818f668390ed1998d5baa2 SHA-256: 881531155d4902cf900f1119eb7818abc58fd4a3d55e5d80f19094c1894a4730
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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, includes a URL that appears to be a lure for downloading content, further supported by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. This suggests an attempt to direct users to malicious sites, likely for further exploitation or malware delivery.

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=the+walking+dead+compendium+download
    • http://kiwez.got-a-man.com/uploads/1/3/2/7/132740763/gususijagijaxig.pdf
    • http://taxibaliz.dinasemrys.com/uploads/1/3/0/8/130814328/jumugojes-gabavebapite-negasovaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/44209827820.pdf
    • https://cdn.shopify.com/s/files/1/0439/1455/9656/files/capitulo_4a_vocabulary_flashcards_sheet_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/jowevofezosibajopajatev.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3586/files/adultery_judgement.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/pivakovuzadibeku.pdf
    • https://cdn.shopify.com/s/files/1/0463/6085/4683/files/rufaj.pdf
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/abordaje_de_henry_modificado.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/demography_and_social_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/nivaruxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/rakidijozakivisevazulof.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/max_of_list_python.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_off00006ab0.bin
87cc46d739ab47f27f28f8dc8f43804eab6ae97b25e5a0bc5fb41c96ba4a14cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB0 5120 bytes
font_01_sfnt_off00007bf5.bin
bc307711562da7d950039f2e67448b5dd7ac78343d03033625a84f575df9c093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF5 10084 bytes
font_02_sfnt_off00009e85.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E85 4324 bytes

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