Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fac57b54c259a2…

MALICIOUS

PDF

75.2 KB Created: 2021-01-06 21:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 96d339be5c835fe5426185df1c5f89ba SHA-1: e7ed1b828880fa85f737734d96d0d4c2ed50e249 SHA-256: 56fac57b54c259a244763a552a1ae36a50f58dd07fdf409e1d30bea489a99d38
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, pointing to malicious infrastructure. The embedded URLs, particularly the one to 'cctraff.ru', are flagged as malicious redirectors. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=reported+speech+online+translator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5fe6219d97366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8ca31abf73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f8ca05ded20b.pdfIn PDF document text
    • https://bokitixeloto.weebly.com/uploads/1/3/5/3/135344606/6d9275ce.pdfIn PDF document text
    • https://biwefixosepow.weebly.com/uploads/1/3/4/3/134334309/d31bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5ff5f8ec0c8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f9b34ff2f1a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fd33f039226d.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/wopari/gemudupupokix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d7c51e-e23f-4e82-9b6a-f4209cecfa99/98677386949.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/civ_5_guide_russia.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/diwemafaf.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/hip_hop_historian_reading_plus_answers.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 4956 bytes
SHA-256: 6a74069becf0ddfb62d66592b02e11737a823f4d96d016a2682129c14a8fed82
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10548 bytes
SHA-256: 3fd57b7c14eec5a21b2599bdc15b29fb64d1184db4533cd00aa9f1cc5d801c7d
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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