Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1d95febe9e42d6…

MALICIOUS

PDF

50.7 KB Created: 2020-08-14 01:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd055397950ce6ec43f502ebcb5dc28 SHA-1: ee558829013929ef79917e6760cf351ef7325344 SHA-256: da1d95febe9e42d65baebec9714031a7ee251df2bb06613972efa37de827f85f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirector strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Oviparous and viviparous worksheet' and references wkhtmltopdf, suggesting a lure to disguise the malicious links. The primary intent appears to be directing users to malicious websites through these embedded links.

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.ru/pify?keyword=oviparous+and+viviparous+worksheet
    • http://pojojeper.nottsu3anetwork.org/uploads/1/3/0/7/130776407/solubazo_josuvajifupeda.pdf
    • http://sikawano.saltyrein.com/uploads/1/3/0/8/130813848/dd0887e67db.pdf
    • http://files.mangoconstruction.com/uploads/1/3/1/4/131437984/4441414.pdf
    • https://cdn.shopify.com/s/files/1/0429/0494/4807/files/zawixamugiros.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/betaseron_prescribing_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1056/files/lobisagavaxip.pdf
    • https://cdn.shopify.com/s/files/1/0445/3181/0463/files/parasitoids_behavioral_and_evolutionary_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1685/files/9913495547.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/advanced_sql_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/retesubef.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/xifilejulologowagaroga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/semolusumawugadoboni.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0095/files/69280531792.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076f8.bin
c1697f9d3fb46af6444721f9ff2d95df2f4fff7e0f4a82b62d1967c70cb4f015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F8 5140 bytes
font_01_sfnt_off0000887c.bin
a7a4949d8559bea92880341486bf6770457c0941ed12643a15dce5d4efa958ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887C 12144 bytes
font_02_sfnt_off0000b019.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 4324 bytes

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