Malicious PDF — malware analysis report

Static analysis result for SHA-256 23723a6484087bf9…

MALICIOUS

PDF

44.8 KB Created: 2020-09-19 04:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b5124e28650ce44f439b3612ae0ee3e SHA-1: 29f6130c6f3c1a8486752801d17343d5714f7b46 SHA-256: 23723a6484087bf9dc918a36d0664f1a3a3ffd7e92cb62f9757d089d4ca1702e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which are part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector. The document body itself is largely obfuscated but contains a reference to a URL that also appears in the link farm. The primary attack pattern appears to be SEO manipulation, potentially leading to malicious content delivery.

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 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.
  • 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.link/wix?keyword=great+depression+political+cartoon+fdr
    • http://files.roanoketennis.org/uploads/1/3/0/7/130739084/jevigadiguwat.pdf
    • http://zedoko.deodd.com/uploads/1/3/0/7/130740003/db3f04193e6efbb.pdf
    • http://gozit.piecesoftimesouth.com/uploads/1/3/1/4/131408229/d4bd4.pdf
    • http://jupadube.kellyhowellphoto.com/uploads/1/3/1/8/131856080/sixigosuluge_futexiwi_bemoguluwuxam_bufem.pdf
    • http://vukavule.sharereuserepair.org/uploads/1/3/2/7/132712348/1125460.pdf
    • http://radod.veganempire.net/uploads/1/3/0/7/130738568/xidiz_dadabosuvasidom_jidela.pdf
    • https://cdn.shopify.com/s/files/1/0439/3621/9291/files/dodawukadidav.pdf
    • https://cdn.shopify.com/s/files/1/0436/0044/5597/files/besizejiwifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8434/files/causative_and_passive_exercises.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000737f.bin
6e238aa34ae6ef43b706a56ab8cb1e5be199b60f28aaf7e06bcca743b22aed28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737F 5180 bytes
font_01_sfnt_off00008530.bin
30d2dbcfd40b2c4536cf188fb65830085c77ee193470541a66eecc38ee2b8d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8530 9828 bytes

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