Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59fc0f4ff3ad333…

MALICIOUS

PDF

35.7 KB Created: 2020-10-05 15:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ad968190b7d37b21885243e1fda183f SHA-1: db1ae9781922f40ef031cbd5d51a5653aee09e95 SHA-256: a59fc0f4ff3ad333a1c24bff9410bfc460a180ea9beed73551c6d885b11889fe
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a datasheet, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=sungrow+33kw+inverter+datasheet In PDF document text
    • http://files.winstonawilson.com/uploads/1/3/0/7/130739750/filub_dovolox.pdfIn PDF document text
    • http://berov.oakhillcontractorsllc.net/uploads/1/3/0/8/130873995/lunojumu.pdfIn PDF document text
    • http://files.wsochicago.com/uploads/1/3/1/3/131380354/bozuluzes-vokisuwu-xefeguw.pdfIn PDF document text
    • http://files.menalivebalm.org/uploads/1/3/0/9/130969198/fuvimopufeweg.pdfIn PDF document text
    • http://files.echocoffee.com/uploads/1/3/1/4/131483266/leritafatume-mokozivomu-xatipixupefejix-tepilamutidos.pdfIn PDF document text
    • http://files.mercerlanecollective.com/uploads/1/3/0/8/130814714/milijiz.pdfIn PDF document text
    • http://nakulare.brandito.net/uploads/1/3/0/7/130776008/c0512094658.pdfIn PDF document text
    • http://files.musicforyouth.net/uploads/1/3/1/8/131856333/a2bf2.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/1cfbfe1d-5b53-4db2-99dd-d7e2cdd48f3e/57142846340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd087c6-8171-4933-92d9-e58aad463940/49331116505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d41384-1a93-4f8e-be9c-b7cf61a84b73/54468650383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f9d4c2-f24e-478a-90fd-828eb28feb1e/74721747523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5563/9459/files/reflecting_points_on_a_coordinate_plane_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8155/4325/files/jojupovomixewapubufovag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/2170/9724/files/summon_skeletons_poe_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6668/6617/files/wivagefowulufomirajodul.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_off00004d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D06 5540 bytes
SHA-256: d7477327b460d54af611511cbc091ac87dc9a97100d21442b72fff61a5f8a313
font_01_sfnt_off00005fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 9956 bytes
SHA-256: 0ae9805cefd5e985b8afbf492705b16153b20d0df11e55ad0531731814113179

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