Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df9a44b25171ab…

MALICIOUS

PDF

42.5 KB Created: 2020-10-27 04:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a89b3c64832ce562e1991dffa48b2a0c SHA-1: 7b987aeb282aeb05b28097e087ab725d522785bf SHA-256: 85df9a44b25171abbac4860240e99609f75841f19826a21ab0d76ca0b432fd89
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing or malware distribution. The embedded URL is disguised as a search result for an audiobook, likely to trick the user into clicking it. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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://ggtraff.ru/123?keyword=bobby+fischer+teaches+chess+audiobook In PDF document text
    • https://tozupetap.weebly.com/uploads/1/3/1/3/131383790/0580c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f968df6f05c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f890b0453dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f89bafcc8870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8a5857216cc.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/1864079.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/gakabixu.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/5308980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/860d20ac-b439-4133-a5b1-5925e2a5305b/votapodome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33850d7f-26b2-4f7c-ba05-95eac265ba76/55801871135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87d71b6-f323-4a5f-982a-ca9e4cd3c9de/kezetizadedibakogevibope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0657f7-2524-48ab-8755-bf31058763f1/dajimiwukawimo.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/octet-_stream_to.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/diagramme_de_bode_second_ordre.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/27868033678.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/lilobewe.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/calendario_2019_escolar_2020_madrid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2289/1187/files/lean_manufacturing_articles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3320/9243/files/geometry_dash_full_version_apk_for_ios.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 5432 bytes
SHA-256: 321f9046f4050815e8dcda83c835125cf5abbef9cc349d9f705c1a0ad043afc5
font_01_sfnt_off00007854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7854 10680 bytes
SHA-256: 5a5f5b9de6a0c467f235bb6c5496df096adb749eba8edf1df0fd88f2f2859576

Open this report in the interactive analyzer, or submit your own file for analysis.