Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1252501c5e290e8…

MALICIOUS

PDF

50.5 KB Created: 2020-11-06 00:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e4079d288f383241504b11101955523d SHA-1: 43eeb7f66c8fb29b756eb3c40c35ae526c9d4192 SHA-256: a1252501c5e290e8f2c85fecc62d3f470d757d08858d0b68aaa50911c13eff33
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, specifically for linking to known malicious redirector infrastructure and for containing a large number of external PDF links, suggesting a link farm or SEO spam campaign. The embedded URLs, such as 'https://traffmen.ru/strik?keyword=mesopotamian+government+structure', are likely intended to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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://traffmen.ru/strik?keyword=mesopotamian+government+structure In PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/6018636.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/3230462.pdfIn PDF document text
    • https://sefuzogesosemo.weebly.com/uploads/1/3/4/5/134579576/f89d99091cb00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f9b4694b62dc.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/3916656.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/mebijubiwuxakep-pamomabijumora-jaxiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f96a27fcc4fc.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/95615501-373d-4f5e-8d19-cd24a6694125/rofinifabusefidajupuva.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/phillips_screwdriver_size_0.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/canon_5dsr_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/dobajiruxusafolexemito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf555ed7-2cb3-4dc2-8aad-39b1d1fd7e53/69339083024.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/77369967098.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_off0000868f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868F 5288 bytes
SHA-256: b011597bcefc1478144d8a4ea6f3eaa8c6ce0fc394d3b9d413fc7a4e09e7d789
font_01_sfnt_off0000988e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x988E 10708 bytes
SHA-256: 02b9aeeaad8671c148f03a12c21bd4a7eea7b55842295bcaa7fb2b34896b0cb9

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