Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f644fed8976373b…

MALICIOUS

PDF

78.2 KB Created: 2021-01-12 10:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5cbce19ef11e7179194ef15df550ea46 SHA-1: b2c510a4ec75e5935695489e463c10a79e9956e3 SHA-256: 9f644fed8976373b97a4dee3656006d3ff3d44778dd0721be9b7004f84b9259d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One of the primary URLs is identified as a malicious redirector, indicating a high probability of leading users to malicious content. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/aws?utm_term=android+games+with+ps4+controller+support+2019 In PDF document text
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/f73b350.pdfIn PDF document text
    • https://zuwositoxo.weebly.com/uploads/1/3/5/3/135315809/1290a9bc79c7d8.pdfIn PDF document text
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/kokamarof.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/PYjd1dd/100_pic_quiz_baking_answers.pdfIn PDF document text
    • https://site-1175941.mozfiles.com/files/1175941/prison_escape_2_new_jail_mad_city_stories.pdfIn PDF document text
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/299d1276.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/fuzas_sererob_vidifeguzewu.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/gutavono.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/tunubiman.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/kilejux-zidonavixisokan.pdfIn PDF document text
    • https://site-1175279.mozfiles.com/files/1175279/how_to_defeat_herobrine_in_minecraft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/5500497329.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 6020 bytes
SHA-256: 1fbca38d4c1750452103f0cdd7bd282e7a105e0e97b437386e1493668b2aab20
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10700 bytes
SHA-256: a260558e4026382a6301e05e671aca026c8fab201db591f814d19c2e1a95b429
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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