Malicious PDF — malware analysis report

Static analysis result for SHA-256 e493c54224c430c6…

MALICIOUS

PDF

119.4 KB Created: 2020-08-31 19:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95e5d21ec527606d7a471e40c490911 SHA-1: 958f0ce1fb28dc21220e5bdb19d2c01efaf57530 SHA-256: e493c54224c430c6bfd05235fc11b8b3380dabe02db67af21f524e4aea2dec86
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier also flagged this PDF with high confidence. The primary malicious IOC is the redirector URL, which is designed to lure users to malicious infrastructure.

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.cc/pify?keyword=brachiosaurus+dinosaurs+information
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/brexit_agreement_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/audit_of_current_liabilities.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/2206/5557/files/xejurisebibu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/white_apes_vs_john_tamil_movie.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/dokezurajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6512/2720/files/cindy_alma_sad_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3205/files/composite_functions_table_of_values_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/vojalaweburim.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/annexure_e1_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7554/files/78129812749.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/mosexakevuveditefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/misopowofizixumatuju.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/what_does_interlaced_png_mean.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8913/files/ziwosifiruzosa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/binomial_theorem_questions.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_off000188d8.bin
6692f7c09da4bdada8f863567ecd1c4fdc42979cfad41c92ac2ceae555406c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188D8 5280 bytes
font_01_sfnt_off00019a9b.bin
70b844f74996fcee5e1d27ce90af7085dab18ef8498285b96f5f41c426451930		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A9B 1716 bytes
font_02_sfnt_off0001a341.bin
440fd55bc7ba29e947d48e3ded9bd24af3d19253ca2676e995fc12cf444dd0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A341 13188 bytes

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