Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c12e8154f72bb9…

MALICIOUS

PDF

94.5 KB Created: 2020-08-10 05:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d157d3742f782a1ad77610ca08d308b SHA-1: 6fe2318a45bea8ee4bafd7fa4ac09d237197d96f SHA-256: 87c12e8154f72bb9938c18b9b174e7dd1b05120f509fabd95c6d93d02308a3a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'cedulas de identidad ecuador pdf' and the malicious URL itself. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests a link farm used for SEO poisoning or traffic redirection.

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=cedulas+de+identidad+ecuador+pdf
    • http://wedokaw.wilsonramband.com/uploads/1/3/2/3/132303374/kerodotiteliv.pdf
    • http://files.ostler-moves.com/uploads/1/3/1/8/131871730/minor_xanemegivepele_mokiginagit.pdf
    • http://files.backcourtballers.com/uploads/1/3/1/3/131379320/dozoxijorizum.pdf
    • http://sogaror.uilmusicregion11.com/uploads/1/3/0/7/130740178/4320fb5899.pdf
    • http://ribug.ipsma.info/uploads/1/3/0/8/130874276/6292748.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4233/2057/files/pdf_bookmark_maker_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/85612171154.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0951/files/14900697996.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/wolf_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/1605571216.pdf
    • https://cdn.shopify.com/s/files/1/0428/4379/9719/files/4853100542.pdf
    • https://cdn.shopify.com/s/files/1/0432/1116/1768/files/31269454302.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/varizedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/rukodutijez.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000153bd.bin
c758a40925583d9d5ea92598d291f737a0538ce6bdb47e2cfe439d323ec7b60e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x153BD 16640 bytes
font_00_sfnt_off00011a80.bin
ae310aefccfc98b1a1757444c383d198361299a7856f06c0fb69049155dcfbe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 5052 bytes
font_01_sfnt_off00012bb6.bin
6ed2717e26f8270b49ab46a76805973b86e72f5bf6b83e14244db660bfface1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 12184 bytes

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