Malicious PDF — malware analysis report

Static analysis result for SHA-256 18449a55291e7eb7…

MALICIOUS

PDF

69.1 KB Created: 2020-11-03 09:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 883e26e8a546468299a544e2f8330350 SHA-1: 4bfedfb4f2f95c9cfb7474daa8fc7a236504b5f8 SHA-256: 18449a55291e7eb7d689a457c16b0aac94dfa4ee5e49ce70586201a0dad45fa7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of an SEO link farm strategy. The ML classifier strongly indicates maliciousness, suggesting the primary goal is to redirect users to malicious infrastructure.

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=rolling+ridge+elementary+school+sterling+va In PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/c8d430.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/bidowapiguxu.pdfIn PDF document text
    • https://kifelulamexeb.weebly.com/uploads/1/3/4/3/134310841/8596152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6835/3431/files/tuxusokeveduti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2680/6448/files/87503574389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0801/4514/files/raid_shadow_legends_best_champions_for_clan_boss.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/dr_strange_123movies_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8486/6245/files/69500626672.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2382/5578/files/drayton_digistat_30002_user_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7896/5166/files/gunship_battle_helicopter_mod_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66a9a50-5a6c-4a81-ad71-1b35017bdd64/6377271151.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/dekemomubijadawavodejebuv.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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 5520 bytes
SHA-256: fa019f6aca8d1e5c150937e0bd50e525690f62b32ed1e796c64cfa9d68bd9eb8
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 11396 bytes
SHA-256: cf167303d3b650c29f92cbd3eb7c8fa95d362c87117ab1f3a39439dd30e9c131

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