Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58ddab5da8d2f8c…

MALICIOUS

PDF

51.6 KB Created: 2020-08-07 13:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df83aa7c2392bce051fa1227d5e37603 SHA-1: eb0a189c8f5100a8184769eb4b13d36cfb7226f9 SHA-256: a58ddab5da8d2f8c412d42afe77c0e46e753bec9c571d48f5239dcee28818348
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free download for 'B. sc chemistry books pdf free download'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to obscure the malicious destination. The ML classifier strongly supports the malicious verdict.

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=b.+sc+chemistry+books+pdf+free+download
    • http://files.psychgroove.com/uploads/1/3/0/8/130814706/0762770030a5.pdf
    • http://files.elizabethrona.com/uploads/1/3/2/6/132681969/xavasikifipigog.pdf
    • http://saluded.tifpublishing.org/uploads/1/3/0/8/130873995/2004823.pdf
    • http://files.strongholdinteriors.com/uploads/1/3/1/8/131871659/5258637.pdf
    • http://files.dancingtribescotland.com/uploads/1/3/0/7/130776661/jomakufobiw_kunuvubaf_bafudajitafige_pimexodexiguk.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/liwiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7349/files/raag_bhairavi_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/certificate_of_appreciation_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88490435411.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7148/files/fusetuxan.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/15036216634.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/tegul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0431/5974/8769/files/16933301031.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5594/files/shameless_opening_song.pdf
    • https://cdn.shopify.com/s/files/1/0439/0676/0856/files/73311369467.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_off00006a29.bin
b72d7119a465cbc9122e765a4f2d18ff0308d9d2e42dca8c3b29817ae87a8e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A29 5872 bytes
font_01_sfnt_off00007e16.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E16 1800 bytes
font_02_sfnt_off000086a3.bin
80f2a8a59d6989353d1cf3f32f8c2ae809da77201748fd9671b0b27efe9157f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 10288 bytes
font_03_sfnt_off0000aa0a.bin
9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0A 16068 bytes

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