Malicious PDF — malware analysis report

Static analysis result for SHA-256 155b4e1aedc43c32…

MALICIOUS

PDF

54.3 KB Created: 2020-10-27 00:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 29e569a42e2195c4214a545eb921c880 SHA-1: 0f3b2a1c7a23e7eabb7d6ab62e1ee6977cb731fa SHA-256: 155b4e1aedc43c323f1ba23e0e48cfcf037b54e1d3231d2cd155365dfb68dab1
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://ttraff.cc/123?keyword=cooking+mama+recipe+list'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to generate traffic or distribute further malicious content. Although no scripts were extracted, the PDF structure and malicious links indicate a likely phishing or malware distribution attempt.

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=cooking+mama+recipe+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5f8f557d44286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f953bf0d3bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f873aa2cc611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f933460387ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404123/normal_5f93665e4c793.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/57552c20-57a8-45c5-85d3-4bf57e588829/napetipavaraga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14e4f45-6c4d-4342-86ec-45970a975fca/75293142563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415f0365-d82e-4de6-a3a2-6d9e4b0ba0d9/bofijeweridesinaredozibit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71738a55-b00b-4b23-bf8a-8a68412d3dc3/73756390158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fdcb11-0688-4f2e-8004-76d1874e6bc2/43182979317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891439f1-697d-4163-a056-3e233227635e/zegulogumupatitavafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ca00d0-c115-4177-bf1d-d655ae498cc9/98081981977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9461db97-498a-4da5-8073-821c04d9cced/nivifukizomijem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f787f2c-b36d-4df4-8173-0ef713a812f2/ramogufazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2818/4231/files/615869354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6694/5447/files/18168325607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0435/2429/files/70996808066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9390/0455/files/karakteristik_studi_kasus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6845/4581/files/55277444215.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5920/3234/files/kitchenaid_k45_mixer_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3840/6806/files/18511931897.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_off000095f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F5 5224 bytes
SHA-256: a881a68ba84b0126f271675f1a948f65ce4588de9f6444ec136e197b3d302bd5
font_01_sfnt_off0000a7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A2 10676 bytes
SHA-256: 6ff980ea774d0e157ac3f156a567900a901ef786d94d969fafd30cc76fbb704f

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