Malicious PDF — malware analysis report

Static analysis result for SHA-256 3406ebd0522796e9…

MALICIOUS

PDF

46.9 KB Created: 2020-08-20 14:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3999de0aca75dc6f7839791c80e27f83 SHA-1: 2a987dbeb1b4f2ee87b70346ba0da9b8750f6b20 SHA-256: 3406ebd0522796e9f900db5866c29a1dc6f285e59fc0e4924802d4f4f04c3f5b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to a known malicious domain. Another critical heuristic identified it as a PDF link farm, suggesting a potential SEO manipulation or content hosting scheme. The ML classifier strongly supports the malicious nature of the file.

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.ru/pify?keyword=graphics+performance+chart
    • http://files.avohrecovery.org/uploads/1/3/1/6/131606165/popawam_fuvojegej_ninuku_wusig.pdf
    • http://xubud.influencingstrategies.com/uploads/1/3/0/7/130740514/fe0ff32b43c03.pdf
    • http://files.mb-freestyle.com/uploads/1/3/1/4/131453124/gegukogoloro-kakopetedejes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0453/8499/0888/files/aankh_mare_simba_video_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/pedrotti_optics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/68302748890.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/gta4_xbox_360_mods.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/59844280324.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/colorear_princesas.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/napabotidikavazuda.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/12915918467.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0693/files/archicad_training_series_vol_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/14131020447.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d05.bin
19df24aef492c67758db1e81f7514d25672b09403912189aacb350368c34b475
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D05 5256 bytes
font_01_sfnt_off00007ec5.bin
809aab3a08c1920c67a20663b135bec6dc49c462ce133d24ae1c06af0716ee78
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC5 14932 bytes