Malicious PDF — malware analysis report

Static analysis result for SHA-256 655763ac60ba1b7c…

MALICIOUS

PDF

44.5 KB Created: 2020-10-28 14:34:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3d1dd715517d403a5919924d530621fe SHA-1: ea48ce523cf0122f7806ed51040f500ae2af29c9 SHA-256: 655763ac60ba1b7c7e7519f35fa4e11cafe2d7151861634ffda151fca659b12a
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the document body, though obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme to redirect users to malicious content. No scripts were extracted, but the presence of malicious redirectors and the link farm structure suggest an attempt to lead users to harmful sites.

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://ttraff.cc/123?keyword=stranger+things+bible+study In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8892580d8bd.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/lupewadenemew.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/449769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_5f989b9464431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5f94335302269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f871599bb237.pdfIn PDF document text
    • https://sofuwikomu.weebly.com/uploads/1/3/4/3/134308783/nimutikimekew-wezizovi-wimuxawufa-zudiridukim.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/sorak.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/81f4829a-99de-455c-ae1e-f8e805015626/62972777928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8467bab8-4fd1-4dac-b84d-57ecbbbb6700/27407795291.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1497/9221/files/sojedila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bb1b69-3c1c-451f-8fdc-7c52ef8c3546/doxepepebozurugawefuje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9671/4650/files/sigma_alpha_pillars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f8cbd8-0ab4-4ab7-b932-c55268f73503/18155751065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3517/1738/files/vulofosudewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e665c4c4-60c2-48f5-a6b5-f87f30d71670/17237901044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a20672e-8a62-4ee8-9614-04480b7c5496/lumigawemogowazerunotod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6121/4877/files/23063946625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c66c577-c558-4801-bc5c-3cc0de7fc90a/mesamuxavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2e9971-1418-4246-9c03-168d85c51904/mokisexeboraloji.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/demujekunepejufima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6479/9644/files/32205668822.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_off00006d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2A 5432 bytes
SHA-256: a701376e6b0f1c928253f3a75d83de899c0f3fdf0c0284a15ca17ae24b4ad654
font_01_sfnt_off00007f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9A 10996 bytes
SHA-256: b7a9ac76b966c90a316bcb1c568b3184aa532af267d08b0975c3b06574090186