Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78b908b12b16902…

MALICIOUS

PDF

34.3 KB Created: 2020-08-05 10:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58f44c63fbb3d320570bcb8ffdd61c9 SHA-1: a52a51f48e3645e4be0eaa431c9587f39153d772 SHA-256: b78b908b12b16902f3ff32b9285a8d44cd77799502e7e01c0b2ed1657528075c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel victims to malicious content. The document body, though heavily obfuscated, contains text related to 'Vanaspati vigyan book pdf' and numerous embedded URLs, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

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=vanaspati+vigyan+book+pdf
    • http://files.aicheucr.com/uploads/1/3/1/3/131384429/menaje.pdf
    • http://files.chris-palmieri.com/uploads/1/3/0/8/130813582/pojafuseperojoz.pdf
    • http://files.airlinesale.ca/uploads/1/3/0/8/130874587/nizanuxiwijezi.pdf
    • http://kunak.levelctactical.com/uploads/1/3/0/7/130739835/disope_bikawadigidisab_mudumazop_kefijenesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/zuxotanutetadis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70838758317.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/64771210350.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/aircraft_accident_investigation.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/zoronuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/91512309027.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/dewupogava.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/18701452649.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/8378955924.pdf
    • https://cdn.shopify.com/s/files/1/0438/8870/5688/files/monsanto_stock_symbol.pdf
    • https://cdn.shopify.com/s/files/1/0440/8085/7253/files/2015_rav4_service_manual.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_off00004633.bin
adc664ab2d263c0aa5d43a1058dfea3cdd3de5a0fa2b9327a4e25b3d5e2dea95
pdf-font-stream PDF embedded font (sfnt) at offset 0x4633 5412 bytes
font_01_sfnt_off000058c6.bin
191f5fa621d29ad5c238a6201d95b07f8b6970e45ce9fc0c29ef12b1f4d20228
pdf-font-stream PDF embedded font (sfnt) at offset 0x58C6 10568 bytes