Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a1d0c0cb6ae133…

MALICIOUS

PDF

72.4 KB Created: 2020-08-05 13:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e55caf44153008ab99f95310723ee8 SHA-1: b044190fb773c8800b9ed488b5741b31b76dcf1b SHA-256: 23a1d0c0cb6ae1334949ed856bc33a6f6202cc35316323df3974aa0edaa4c9a0
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF SEO link farm pattern, indicating an attempt to generate traffic through numerous external links. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to a malicious site via the embedded URL.

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/wb?keyword=croft%20cruse%20cognitive%20linguistics%20pdf
    • http://files.caseyscurbside.com/uploads/1/3/1/0/131071041/sugesijizoka-norekonina-rorabajafog.pdf
    • http://bupexot.loanheadcc.org/uploads/1/3/1/8/131856476/wamedikebiwos.pdf
    • http://files.monorailespresso.com/uploads/1/3/1/3/131379256/sawozigosugus_mosoberesexet_kodevizoxax.pdf
    • http://files.julesfineartgallery.com/uploads/1/3/0/8/130814535/tojoruvujoboli.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/neurological_physiotherapy_susan_edwards.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/xunodifurixanowe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/minecraft_dwarfs_vs_zombies.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/96236058828.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/82424110785.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/66716952808.pdf
    • https://cdn.shopify.com/s/files/1/0440/5719/8742/files/how_to_implement_a_hashtable_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/2623919307.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/pavemalesojugukumes.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/deluninaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/xupesemeralu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4571/4077/files/dopanozukuvibubowamukidef.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/ruxetoboriwozufanuxuj.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_off0000dfdc.bin
7d7af75b44a2cdcfb2b378db338c3835aa7b1d06c0117aeec9c0d1834c4e855c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 5080 bytes
font_01_sfnt_off0000f142.bin
d4edc22fc45a746e207a216f2df7f1f34ae3b9ac09556514a0e7e177e0c0039e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 10388 bytes

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