Malicious PDF — malware analysis report

Static analysis result for SHA-256 577dc2f4fce5942e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-14 00:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29bb7eee65b1e9d909a5666768a2345f SHA-1: 084c9d7c954c1abc92cdc58269436d50eec92f7e SHA-256: 577dc2f4fce5942eb718a433d1181b3b277723c88021fa8bfb38dace23c8e386
154 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. This link, 'https://ttraff.cc/pify?keyword=autumn+leaves+sheet+music+joseph+kosma', is designed to lure users into a malicious site. The document also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, suggesting a broad distribution attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=autumn+leaves+sheet+music+joseph+kosma
    • http://files.leoxiiiseminarie.org/uploads/1/3/1/3/131379246/fca09dc4978.pdf
    • http://sesux.michelsacademy.com/uploads/1/3/1/1/131164250/7720159.pdf
    • http://files.tepera.cz/uploads/1/3/1/6/131607565/xemubek.pdf
    • http://files.walthamchangemaker.org/uploads/1/3/1/6/131606965/jimel-sokagapofove-xaxamej.pdf
    • http://volarapor.winczok.com/uploads/1/3/0/9/130969060/7684144.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/dasipinafixofutujezol.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/waxinajarage.pdf
    • https://cdn.shopify.com/s/files/1/0429/4872/2851/files/padebosemonemikaboxaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/vejil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/wojikelakipigusaraxexej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/pogapokigabisivunejaxol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/mimepozijawuvigabubaselip.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/86743735604.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/ca_cuello_uterino.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/62494357011.pdf
    • https://cdn.shopify.com/s/files/1/0437/0461/5066/files/49079685069.pdf
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/79713158737.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_off000052c8.bin
ce58406ee6827f2ca26328f0bfb411cb00792e81bfac4132865c5abfcf02e9dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C8 5268 bytes
font_01_sfnt_off0000648c.bin
d585a098a144d81934a6d9945700f543c6475ee635489b3ac5df031364bc7f28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 14824 bytes

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