Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e17d8bbc0f1537…

MALICIOUS

PDF

38.5 KB Created: 2020-08-22 22:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c47aa6a49ab11a0350a43b21ba98c3c SHA-1: da48716253dc3e5318e19d3a87af21bd8e539615 SHA-256: 09e17d8bbc0f1537b8843e0060b1c2d8c92c4775227cbd24e41c463ab1370eb9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'biological classification questions' and references the wkhtmltopdf tool, suggesting a lure to trick users into clicking these links. The presence of a link farm heuristic further indicates a malicious intent to drive traffic to potentially harmful sites.

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.com/pify?keyword=biological+classification+questions+for+neet+pdf
    • http://tolemi.calvarylutheranscottsbluff.org/uploads/1/3/0/7/130740596/kujexebaziwe.pdf
    • http://files.rebeccafittonprojects.com/uploads/1/3/1/8/131858044/kikitopu_duwekudori_dikapaxozili_fesuku.pdf
    • http://jixiwa.doreenfarewell.com/uploads/1/3/1/4/131453274/9086289.pdf
    • http://botevefev.cosmicsistershop.com/uploads/1/3/2/7/132712237/4c47ecdde78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/wachapreague_fishing_reports.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/20144997059.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8503/files/78483735168.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/35470093210.pdf
    • https://cdn.shopify.com/s/files/1/0460/9182/9412/files/zirotanesobajokula.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/yamaha_c3_scooter.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/stages_of_meiosis_1_and_2.pdf
    • https://cdn.shopify.com/s/files/1/0438/9689/7704/files/73207936309.pdf
    • https://cdn.shopify.com/s/files/1/0430/6848/9881/files/cbr_test_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2411/3049/files/everything_is_figureoutable.pdf
    • https://cdn.shopify.com/s/files/1/0450/4292/5726/files/amazing_grace_violin_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005755.bin
0b9cc55b9f719ba0132138d6c943eb1b6e48bb207f41b5978e7c2db7875ac05c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5755 5500 bytes
font_01_sfnt_off00006a07.bin
b8df131e6572c7a924577ea6d8b5d7084eb633c53377c243be72c863074fb66e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A07 10260 bytes

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