Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9d22a70ee0c249…

MALICIOUS

PDF

43.7 KB Created: 2020-10-15 16:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c9c5375f48d59e1d35907ac8cdb6a86 SHA-1: 34d5f220a51a41cc09ecc6a090f5fcc8b50183d3 SHA-256: cf9d22a70ee0c249ed25d813599f896cc1626dd8b2cc6559909daef9208c6b95
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified as a link farm, directing users to potentially malicious websites. One critical heuristic specifically flagged a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to PDF compression and a URL that aligns with the observed malicious link patterns.

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/strik?keyword=compress+large+pdf+into+small+pdf In PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/64722d3.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn PDF document text
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/5639838.pdfIn PDF document text
    • https://site-1040576.mozfiles.com/files/1040576/gusaloziwep.pdfIn PDF document text
    • https://site-1038572.mozfiles.com/files/1038572/libiguxoruva.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/486cc5d9-2ca5-4567-869b-e527a0f441e2/befubimazojajekob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606bb3a4-daf5-405f-8353-a0830173873b/87303687756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cec162-34b7-4d0c-8d48-7ec0d71515e7/80656134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6743/1329/files/kukoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/3271/1846/files/difference_between_depreciation_on_balance_sheet_and_income_statement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9484/4587/files/craigslist_austin_texas_cars_and_trucks_for_sale_by_owner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/vaxipikebebad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8043/6898/files/mercedes_e_class_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/kuxubukegeguteju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/1986/2694/files/the_other_side_of_immigration_trailer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0971/2023/files/rare_amc_muscle_cars.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6811/9445/files/94803515755.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2092/9189/files/vision_fitness_bike_r2250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2792/5661/files/blazefire_saber_ff13.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2148/3687/files/disidoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5517/8150/files/27948294928.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_off00006c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C40 5268 bytes
SHA-256: f6008251de76f6425e75d904aa92353f640f47420726f82a17a1a83d57405f91
font_01_sfnt_off00007e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0F 10292 bytes
SHA-256: 19f4417284c73537c7f0aba7bf255abc2dcfccbceac00bf6e50ba04929fcb315

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