Malicious PDF — malware analysis report

Static analysis result for SHA-256 a514d8a16ddff9d1…

MALICIOUS

PDF

101.4 KB Created: 2020-08-13 00:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd5801bc53736609d65d9e176639a00e SHA-1: 6844707fc17778e022aed812591844b55f138449 SHA-256: a514d8a16ddff9d139faf90526c72c5bd2aafb94057595b262381e92c40121b2
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is used in the redirection. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO poisoning or traffic generation. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=javascript+interview+questions+and+answers+for+freshers+pdf
    • http://files.howardcountyschoolhealthcouncil.org/uploads/1/3/0/7/130775760/e72c83ccd0c.pdf
    • http://files.hilltoplife.com/uploads/1/3/2/7/132712323/sazetok.pdf
    • http://files.starlitedance.ca/uploads/1/3/0/7/130738722/1451956.pdf
    • http://files.shoppesatbankscrossing.com/uploads/1/3/2/6/132696249/0d02e.pdf
    • https://cdn.shopify.com/s/files/1/0439/2353/8088/files/88766357029.pdf
    • https://cdn.shopify.com/s/files/1/0434/8254/6341/files/gobijudowu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/72356915447.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/causative_verb_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2289/files/kixarikenaresuxageke.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/disney_cinderella_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/fuwelaluronagafomovojewer.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/59348754374.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/laminas_perspectiva_caballera.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/46101926440.pdf
    • https://cdn.shopify.com/s/files/1/0440/8524/8165/files/89754124643.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f54.bin
324d208c9a5f9bf5432e0fb2f8316f6d299eb788e74e429d98132f39b25d2248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 5476 bytes
font_01_sfnt_off000131f9.bin
3326041dc672214ebb644a8a6804ea74cb1703580e609436f2bb7f5feed95965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 4360 bytes
font_02_sfnt_off0001425f.bin
bf20db924bf59a3aaaa4c8333d2ff4a56944f23b096fe43c7f5843265d69777c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1425F 14564 bytes
font_03_sfnt_off0001713c.bin
18820e64b89489c6901bdbad9637cefc87d81bb55776bf10726fbc7439458c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1713C 16336 bytes

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