Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cdb2b93a7bd3bf…

MALICIOUS

PDF

44.2 KB Created: 2020-09-27 19:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ae89e96c564c9adc839e8260e09b901 SHA-1: d3a188eba52a4bd66419a616722becf6d30c2eef SHA-256: 33cdb2b93a7bd3bf091e94f50129b1c0fc4426062f360dd1c9a81df168faf054
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with heuristics identifying it as a malicious redirector and a link farm. The document body, though partially corrupted, contains URLs that are also present in the heuristics, indicating a pattern of directing users to potentially harmful external sites. The ML classifier strongly supports the malicious verdict.

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.club/pify?keyword=arduino+map+function+in+python In PDF document text
    • http://nebes.packitindumpsters.com/uploads/1/3/1/6/131637679/9850609.pdfIn PDF document text
    • http://files.3ganfantasyfootball.com/uploads/1/3/0/9/130970012/budafadili_wovogotul.pdfIn PDF document text
    • http://files.isee-europe.com/uploads/1/3/2/6/132683292/dedukobomo.pdfIn PDF document text
    • http://files.buycolorfest.com/uploads/1/3/0/7/130739415/9938386.pdfIn PDF document text
    • http://files.uscmtr.com/uploads/1/3/1/4/131453086/zapunof.pdfIn PDF document text
    • http://files.trashcanterry.com/uploads/1/3/1/4/131453061/limeputekugipavibeno.pdfIn PDF document text
    • http://gexibisis.shantellsnaturalhair.com/uploads/1/3/1/4/131453329/27dbc2a89556.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/1/0432/5376/0160/files/39616622125.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/83713231388.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/lalonujogezaxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/viwokotupel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdfIn PDF document text
    • https://193b7137-8c47-4035-b2da-a37a3d951a69.filesusr.com/ugd/02beb7_6f3b9e29d31c4a3fb9ed2e8c6263120b.pdf?index=trueIn PDF document text
    • https://ce182277-fe9a-4610-b498-006ff3e4a289.filesusr.com/ugd/162fe6_2fe375610b1a45a59c7989c0de26ca08.pdf?index=trueIn PDF document text
    • https://e0a11097-d6d1-4c64-9cc4-5a3044bf2a82.filesusr.com/ugd/8bf3fc_07a0abf645c340eb9bc375cdc1dfc226.pdf?index=trueIn 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_off00006308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6308 5276 bytes
SHA-256: 1a3230d72bc9434efdddbfdd23c9476e129ff8ad0201164d1c60fee119272367
font_01_sfnt_off000074dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74DD 15256 bytes
SHA-256: 65b6ea0f07b993d74a5ccf828a459a319df47fb760c3f22454f333cb2d46905a

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