Malicious PDF — malware analysis report

Static analysis result for SHA-256 16773e8131326a04…

MALICIOUS

PDF

43.1 KB Created: 2020-10-07 06:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 52fd602d46e5b9d07f6380bd79089448 SHA-1: 3b73cbb0b15c8dc00b599546672fcae3653b7824 SHA-256: 16773e8131326a040bd6c1ca242227c4063d7a300351fc93310edb3fb942cb90
224 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains and a known malicious redirector at 'ggtraff.ru'. The document body, though heavily obfuscated, contains the same redirector URL. This indicates a link farm designed to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://ggtraff.ru/strik?keyword=desventajas+de+edmodo In PDF document text
    • http://kavoz.laurahawbaker.com/uploads/1/3/1/8/131857120/14c5f0e7bb55.pdfIn PDF document text
    • http://loxetap.jetsetnomad.shop/uploads/1/3/1/4/131406453/8752001.pdfIn PDF document text
    • http://files.brattleborocjc.org/uploads/1/3/1/4/131408131/5354309.pdfIn PDF document text
    • http://files.groundtruthsalessystem.com/uploads/1/3/0/7/130775828/feroguden-gibimizid.pdfIn PDF document text
    • http://files.consulategeneralportugalvancouver.org/uploads/1/3/0/7/130776371/titamovebe_bezoni_witatavokonorot.pdfIn PDF document text
    • http://ronuviwof.camelliayang.com/uploads/1/3/2/8/132814930/692aa8736c37fbc.pdfIn PDF document text
    • http://boxixo.cottageseureka.com/uploads/1/3/1/3/131378816/demirawala.pdfIn PDF document text
    • http://files.ajluxarts.com/uploads/1/3/2/3/132303189/neziv.pdfIn PDF document text
    • http://files.hellotherehuman.com/uploads/1/3/1/4/131438092/zivubu.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/1/0487/0409/4358/files/38852126175.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4970/8437/files/pickup_patrol_app_for_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1111/files/secret_history_of_the_mongols_igor_de_rachewiltz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8572/3816/files/sifodedekepevulixebedudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98515c3b-c8d0-4df9-8227-fec24729f005/pubofijigok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a2bdd3-4b4b-46fd-b744-7808dcd03768/94398966525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636109b4-67c7-4576-bce5-51fc83b9ac8f/19414314159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79deea6-a1ca-41a2-851b-e17e5204aecf/8738318007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff01855e-8f0f-461d-9b60-c69e4de352cc/59489431699.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C27 4980 bytes
SHA-256: 172764b99a00c0480340036e3c52b2008e39d37f9a9368119761c138ed9f4ca2
font_01_sfnt_off00007d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D14 11540 bytes
SHA-256: 1decb303aea403ffe6f4c5cd22692a6667832f99a1713549e246031d76f8b466

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