Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d81cc4ddb6a9b9…

MALICIOUS

PDF

59.8 KB Created: 2020-10-03 22:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d63d015bbe20dda58000385b3fd82f6 SHA-1: ef6b07d11fa677c9f146c8e929d48f8ee4e3a33c SHA-256: 23d81cc4ddb6a9b9a7989255deba4d6049f9967a6eb14d2d9fd41f2a3c07f5fb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs pointing to external PDF documents hosted on various disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. One of the URLs, 'https://ggtraff.ru/strik?keyword=strategic+marketing+pdf+books+free', is flagged as a known malicious redirector, increasing the risk associated with this document.

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/strik?keyword=strategic+marketing+pdf+books+free In PDF document text
    • http://files.rhodesriches.org/uploads/1/3/0/7/130775181/waged-ruparamagumap.pdfIn PDF document text
    • http://files.insightptyoga.com/uploads/1/3/0/7/130775917/9376994.pdfIn PDF document text
    • http://files.p352xparentclubhouse.com/uploads/1/3/1/6/131636689/3631607.pdfIn PDF document text
    • http://files.delamare-photography.co.uk/uploads/1/3/1/3/131381919/wuleg_dajede_rifujo_nizotajafidag.pdfIn PDF document text
    • http://files.ragazzedellovest.com/uploads/1/3/0/7/130739328/8745540.pdfIn PDF document text
    • https://site-1041292.mozfiles.com/files/1041292/6702491810.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/1/0484/3660/9176/files/putaxaxewovimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4849/3475/files/sebopelara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0467/7277/files/central_idea_in_public_speaking_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f924ee5-c26c-46fa-8c26-89dd72fe1caa/73521159248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127ff9e7-619c-45f8-9c4c-6594c9fbc28a/zokegetanowib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2cb0f5-9491-49cf-a002-04cc88994776/28926136227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16e57f5-6af2-42a2-b6b2-d1a9c7adb008/vezeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f75939-95dc-42fa-ad55-6f13bf6d5cef/42810554871.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_off0000aa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA72 5748 bytes
SHA-256: 51c3e9e84d2351d48fb6ecce90a9cdc5005ea1251783ddf4238b8fc3b6d35fcb
font_01_sfnt_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 10536 bytes
SHA-256: debaa21bfed7aad7e1d92df810c7f8d17cf3ba6516a5d77dc59bd9aee14dca5b

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