Malicious PDF — malware analysis report

Static analysis result for SHA-256 88163fd0531a67e7…

MALICIOUS

PDF

47.4 KB Created: 2020-11-03 09:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 60c4f328076ed2d560e0785a1f308399 SHA-1: da1a8d5f96fcce13f8d6f574ad7342d1d6306fba SHA-256: 88163fd0531a67e7a1a169dbd48e191ae49a609018bd162b5884a24336ff377c
194 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 embedded links, many of which point to redirector infrastructure or potentially malicious content farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though obfuscated, contains text related to a product and a URL, suggesting a lure to external content. No scripts were extracted, but the presence of numerous links strongly suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/123?keyword=professional+5%252F8+s+curling+iron+helen+of+troy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407780/normal_5f92e51cb39b2.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5f9695a16ecbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f8bf76875914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5f99487c128b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5f99113f617e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5f9e05ac93d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f8e60eee0f77.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://cdn.shopify.com/s/files/1/0268/7536/3511/files/adventism_in_zambia_by_matandiko.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/82787121215.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/personal_pronouns_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/national_family_insurance_co.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/sap_workforce_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ee58c8-ac5a-4ac5-b783-e09c2f7d754e/laxurunuxaropesinasujap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9105/7568/files/ziged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/2967/3117/files/stronglifts_5x5_deadlift_reddit.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_off00006d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D78 5480 bytes
SHA-256: f9542b36cf69780568cd9deb9efac9bc0e86a97206ed3f4d896f9787032cbbf5
font_01_sfnt_off0000801f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x801F 9992 bytes
SHA-256: aea86592a855eb44603aba6f712115167abedef1685305284cfb97d5f3acb60a
font_02_sfnt_off0000a24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA24D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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