Malicious PDF — malware analysis report

Static analysis result for SHA-256 b166d7ee6e9b3166…

MALICIOUS

PDF

45.2 KB Created: 2020-10-03 13:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7501628debce24c3e8ab7f5e5334900c SHA-1: 980ff6caed85abbdc5f37d89feeff4ccf96a7891 SHA-256: b166d7ee6e9b3166d6543cfbe697eff95a822a01cd2c405d35fcd0d7d4e41fc5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to host malicious content. One of the embedded URLs, https://gettraff.ru/strik?keyword=multiplying+polynomials+using+foil+w, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=multiplying+polynomials+using+foil+w In PDF document text
    • http://files.senecastpatricks.com/uploads/1/3/1/4/131406687/709afb4b1607.pdfIn PDF document text
    • http://files.kurtplinke.com/uploads/1/3/1/4/131437149/gonewapisos_rekafunig_gomezarif_lazibage.pdfIn PDF document text
    • http://files.namicoloradosprings.org/uploads/1/3/1/4/131437677/2610848.pdfIn PDF document text
    • http://files.mndeathcollaborative.com/uploads/1/3/0/8/130874058/9091830.pdfIn PDF document text
    • http://files.sunshinecoastcaterers.com/uploads/1/3/1/3/131379824/7026989.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/1/0431/5791/3754/files/easy_clue_casket_osrs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6017db43-6aed-4824-a23a-bd46b858096a/tazowoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/208bc266-4246-4eee-8598-78c459bce7e0/saruseretijusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73259e53-797a-4fdd-a56f-2d5e70f742b6/zunedaraji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8767a671-365f-4c9d-8ac6-ee60cb6b36b4/wavemazem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3911d6af-e8cc-46a4-a51f-5a8727816b0c/26582260591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0670656-e8a8-4a8b-96f0-221da6023c7a/gixovogekod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f86565d-2d64-4dcc-a606-fca03389bd8f/28955277406.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_off00006e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 5324 bytes
SHA-256: f815c6b64d8e7ba5c450120575f0b644066d7981a229edebe68e1c94c1ffdd96
font_01_sfnt_off00008077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 12168 bytes
SHA-256: f32e40c089d852b8a7ebe562625b2914bc99f181d617365a8d098d1d2be0d754

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