Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4627e4db2c3b093…

MALICIOUS

PDF

46.5 KB Created: 2020-10-16 09:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9fc9e631fdc6dc5874914c8e8b88e49d SHA-1: 53a9d7d13408d60626aa6e874da66ffb9d8ce572 SHA-256: c4627e4db2c3b09379b4f224632f04a41bc7109fa2d902a364b10bba8f6d863d
154 Risk Score

Malware Insights

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

The PDF contains a lure for a 'hotel manager resume' and embeds numerous links, including one to a known malicious redirector. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the link farm suggest an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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://ggtraff.ru/pify?keyword=hotel+manager+resume+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f89003cd2d13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f8927d168332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5f8871ca4f130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f875cc4398d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f88fff3cc646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f892249f3014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f870b0392b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f88a05b52ceb.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/1/0435/0246/9285/files/mini_to_xml_ocr_converter_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3784/1813/files/co_ed_confidential_season_1_trailer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0271/4014/files/buloruluza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2381/7640/files/esign_document_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2259/6768/files/hacked_games_papas_wingeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ae89d9-eaf2-426d-ad13-256b7675f570/58530911888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd11c0b-722e-410c-95c4-eb84f69fd4af/kofugemawisunositonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105fee2e-c0ff-4ed8-af32-d076f6c64701/66022820132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453c825a-ea4d-4a65-8bd2-439f537da1f2/puzunus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d003b04-1d7b-4fdb-8dcd-52dde2685228/fajivif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e45a3b-6898-4a7c-8fb0-8d7858ef5056/14663890997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28af3d6d-1250-402e-9596-c9cb094e1fdf/68820074351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39366b74-56ed-4854-b42f-0b9898c5a119/koxirafij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0d76f6-c611-46d9-a31e-e3972c5e2652/2998264623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8972656-d3d9-4533-882c-3df1f56b6c63/8508636741.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_off000077b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 5320 bytes
SHA-256: 2238b3e43c72254e058282657e375c3867ac21fb7f89a2935fab2cfe5217b654
font_01_sfnt_off000089ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AB 10304 bytes
SHA-256: efbd4565c064d08d72d1649df06cf667eeb517c42cef00171632b72603ecef3d

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