Malicious PDF — malware analysis report

Static analysis result for SHA-256 914ec72c3090fb36…

MALICIOUS

PDF

55.6 KB Created: 2020-11-02 13:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e075a8b38618f36191c5fdeb49c95bf1 SHA-1: 90eea9fa5b1a7e9ec3ce583e5364cb6924754ad0 SHA-256: 914ec72c3090fb36c8fb0dd341c65eb79c0689228ca0e3a14b89644237015934
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.com/123?keyword=kero+the+wolf+dog In PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/8151629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8e986d5e9e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8dec01c6eda.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/c4a8ab88-7a41-4583-9d30-a98ad4b1a305/bopiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a2290d-d6d7-421f-bab9-5d3e4ac1bb66/timurenanibatewokatud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3358/1470/files/environmental_science_midterm_study_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1936/8097/files/wixidasufojusaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17311c3-5e5e-4763-942c-39d3b1c76527/67081006015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9096/7235/files/vixubezalugiwodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ab5a2a-5812-443c-a7bf-1fc3693190fe/55459630512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14888bf8-5007-4dae-8881-0a2a018cf9da/bunepokifodik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc37b8ee-2637-424c-a695-6feb92f5822f/above_top_secret_new.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCC 4840 bytes
SHA-256: e1969505ea9d027e75151efe15baac01b11b36061b09b8e9a12528cf031c65de
font_01_sfnt_off00009058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9058 11576 bytes
SHA-256: e5f2fcf988b817d33462838674ed7f4f7b8f9a1f86ae98414db9246fcfe754dc
font_02_sfnt_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 17752 bytes
SHA-256: 91ff837110915a309650208bf33105ebbadf45cd69eea305f23e7da5ec6aed91

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