Malicious PDF — malware analysis report

Static analysis result for SHA-256 21db324c96928cca…

MALICIOUS

PDF

45.0 KB Created: 2020-09-17 12:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc649c8399d42035c126bab84db6d03a SHA-1: f633511090cacafafef44780caaa00d106f96e4f SHA-256: 21db324c96928cca2c7341cfaa9f7e8cc686d4485ee38ff1b059472ee9b72e5f
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a repair manual, which is a common lure for phishing attacks. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that the embedded URL leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a phishing attempt.

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/wix?keyword=1996+yamaha+big+bear+350+repair+manual
    • http://files.illawarraanxietyclinic.com.au/uploads/1/3/1/3/131384401/e786612.pdf
    • http://pafupapad.ecommplish.com/uploads/1/3/1/4/131453005/2798310.pdf
    • http://files.kickcyberbullying.com/uploads/1/3/1/3/131380354/rozukegalavin-pimijade-malalepe-sowetirata.pdf
    • http://fedemu.nordiclilly.com/uploads/1/3/2/7/132740324/xiferibadozirelabej.pdf
    • https://11cd9a8b-9113-41a2-aec2-7e912a586b28.filesusr.com/ugd/1c8c1e_4324febc438a43ad89ca63b0a784abee.pdf?index=true
    • https://2dfb52e5-4e2a-4c25-81e2-3d23f3badd71.filesusr.com/ugd/dad7b5_86f65085479b45248f16f70e63bb378d.pdf?index=true
    • https://c6eb37bf-d74f-49c1-a24a-daa728b9a62f.filesusr.com/ugd/3be48b_3368fec746934927b75322f137fe3c9d.pdf?index=true
    • https://45b1c17a-8c4d-4c45-b63e-cc9bcd7e2a57.filesusr.com/ugd/469aea_e5b5725c83314469a3a56c011099596b.pdf?index=true
    • https://66dcd8c6-1134-44e7-a500-40932b5faea0.filesusr.com/ugd/a58b01_8d4cde4d86d74e6e865a223bfd43ed68.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/4305/1937/files/49579739010.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/champions_league_2020_fixtures.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/98400441709.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6551/files/bupotebopobeteni.pdf
    • https://cdn.shopify.com/s/files/1/0440/3209/8469/files/patrice_lumumba_congo_my_country.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/63854250034.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/biwovavufefibosakenokedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6719/files/vuvuvepuziwimevala.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c75.bin
4213d6412843838c9373a729365eeed37b749861d0ecf72af0210734f94627a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C75 5996 bytes
font_01_sfnt_off000080bc.bin
04d1d7c3a5feb7f2567a15136093a8aa94a1d6366f6726f3d8a8aae05207feb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BC 11564 bytes

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