Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e8c4f1b3de454b…

MALICIOUS

PDF

41.7 KB Created: 2020-10-05 05:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0dfc24f1bb194df307c8a976776bebd6 SHA-1: 6f27c52dfef3a1254c9190c0b20823716e97491b SHA-256: d1e8c4f1b3de454bd443426bb8001ee87f05acc0ad0928219a5d7d28fb31c4ba
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF filenames, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

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 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://cctraff.ru/pify?keyword=2015+ap+calc+bc+frq+6 In PDF document text
    • https://site-1037182.mozfiles.com/files/1037182/ximanilanegiragiregowuk.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/fuminusetojon.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/gafesujajere.pdfIn PDF document text
    • http://lakexe.glamourembalmer.com/uploads/1/3/1/3/131383652/xivep_kitisagodutixi.pdfIn PDF document text
    • http://zigozevu.renegibson.com/uploads/1/3/1/8/131872295/wipabumoparalowaf.pdfIn PDF document text
    • http://files.kimberlyaboltin.com/uploads/1/3/1/6/131606273/vaxuzukimesulo.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/029dc03b-9dfe-494e-b48c-972198f68622/zopibiraxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9745d5-d513-4fd2-bc67-3b7085ea7fe2/98906254432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3c63b4-43e1-4383-898d-b1ff8633a12f/31409169576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f252adf5-1f59-4f56-80d0-e452fd2128b1/57856432442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/98455745237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8620/7894/files/c_tableadapter_update_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8866/1666/files/94860193605.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0981/7251/files/6551453201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/the_atom_worksheet_answer_key.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_off00006387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6387 5608 bytes
SHA-256: 57372fae032e6aca9962aee12bffe1165a06de454ec0a857658473c58ab98597
font_01_sfnt_off000076b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B1 10252 bytes
SHA-256: e1c79460b58054541ebb3e444e55c45bcf3afa962b3585d934d09ef5224313c8

Open this report in the interactive analyzer, or submit your own file for analysis.