Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed4881acc70945c…

MALICIOUS

PDF

53.1 KB Created: 2020-10-30 07:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 759a264a08064e349a494c806518c791 SHA-1: ea907938592f8b955dbbb796c85207749c7c4bd2 SHA-256: 9ed4881acc70945cd86cc1b5df37eced0cd9309053cdcb5aed4520d035113d35
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.cc/123?keyword=krups+espresso+machine+manual', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, indicating an attempt to drive traffic to potentially harmful content.

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.cc/123?keyword=krups+espresso+machine+manual In PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/9729220.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/dadisoverobeludosa.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/5631190.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/sivav.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/jujapatuzevu.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/2736734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/febopa/paranalaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/xikajinir.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/my_state_history_com_louisiana.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/34298913502.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/robocop_apk_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd248f1-7d41-4f18-b58b-0efefcaf9289/crossvent_2_manual_espaol.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9161 5144 bytes
SHA-256: 409f249d8a97a8563ccfc3a478eccfcba645c04d38ce9ea2c405d9bf1a298d01
font_01_sfnt_off0000a2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B2 11020 bytes
SHA-256: 77274637988ca47a929115e5564d79ded6109bee958b9471c625a32ab0e2b598

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