Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b72a8e09cbb4e0…

MALICIOUS

PDF

43.0 KB Created: 2020-10-08 23:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4ed987ab59b8b6053e3f477f516dcdf SHA-1: 1224984acf55bdf7b8fc5b685734fa1d4640c714 SHA-256: d3b72a8e09cbb4e0911565719ada6f6308ab641fcdf3594ccbf1dcf2bdf5aa46
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a known malicious redirector URL suggests the document is designed to lead users to harmful content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/pify?keyword=carrot+top+wife In PDF document text
    • http://files.rikrecruitment.com/uploads/1/3/2/6/132682124/5864b095f2b5f14.pdfIn PDF document text
    • http://files.eng.chamonixpatinage.com/uploads/1/3/1/3/131380158/cd76f9cf.pdfIn PDF document text
    • http://lotedoduv.northdevonlabour.org/uploads/1/3/0/8/130813306/6640806.pdfIn PDF document text
    • http://limefaj.thewarmingcompetition.com/uploads/1/3/2/3/132303035/1298827.pdfIn PDF document text
    • http://files.jerrygarciafoundation.net/uploads/1/3/0/8/130874580/8167665.pdfIn PDF document text
    • http://gefon.isladventures.com/uploads/1/3/0/7/130776487/metopasuganu-ratibalokepa-jejab.pdfIn PDF document text
    • http://files.loneoak372afm.com/uploads/1/3/1/4/131482887/tamin.pdfIn PDF document text
    • http://diluponut.ballycastlehistory.com/uploads/1/3/1/3/131380600/xebijidavolo_rawudetaf.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/1/0434/5780/6488/files/me_gusta_meme_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4438/1082/files/51991298258.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2622/7093/files/boc_prevention_and_health_promotion_study_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b737c7d-da91-44a8-8def-1dd8405ef7e0/gikokoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fed701-18cd-4983-bbeb-a8cfd6500c17/revuwozekiwok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e86f6cd-8cd3-4f94-832d-b0a6963d14fa/funat.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_off00006d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 4684 bytes
SHA-256: 4407bb11125231cf18dd9ec7a7ac2af3cccb9a1f798c284ea07e08addb208158
font_01_sfnt_off00007d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 10120 bytes
SHA-256: de2916c6e914d1bf89f0ee8ab52f1365618ee7c31a9c3bccf644dc51d841734d

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