Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51d3e817ed52b83…

MALICIOUS

PDF

36.7 KB Created: 2020-10-28 03:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ad65fbb09fc3fbb736e8d53620a35da7 SHA-1: e0a3e796e5f4945e1c3865edb47fcf9a23ad2b3f SHA-256: b51d3e817ed52b8318c6d44f41242387501b477f579588c8880c89ab6dcac270
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, specifically pointing to a redirector URL that is known to be malicious. The document body also contains the same malicious URL, suggesting an attempt to trick users into clicking it for a 'free download' lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=cool+math+games+unblocked+sites In PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/2860539.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/vetetikosotuzafiwop.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/fovokozed.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/karevinajubavi_gudodakabi_folujimi_zarafenokodu.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/0f4937e54b27.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tadib-pepalitegugoj.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/1516d0fc8a.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/a47c99e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8cc54347a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5f8fa17a7597b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f96eb588bbea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_5f95eba3d4616.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/6a8e2022-eb69-4221-81a7-6437d2a3b801/traduccion_del_nuevo_mundo_de_las_santas_escrituras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934b9c34-3e11-4376-a6bb-f804b7b79adb/insigne_de_faction_blade_and_soul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f16769c-85f2-4851-8fec-0c1f562a9448/duzamupew.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/56003796654.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/morfologi_jamur_beauveria_bassiana.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/begone_satan.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/design_methodology_in_architecture.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_off00005113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5113 5364 bytes
SHA-256: 208ef3ee0e51e7d9999a546a6724d0d17841e6ffae8ee2b071fcc338b2e85a7a
font_01_sfnt_off00006330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6330 10032 bytes
SHA-256: 52692b39aac71f3b9e54ed5a38966f4b9a933f59ce001f168698864813067306