Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a61fd2973a0c399…

MALICIOUS

PDF

51.5 KB Created: 2020-08-20 13:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef5e293da6a543b59d16f64800e535bb SHA-1: 79c90df48adf82850fa8e0c933a7411c9561632a SHA-256: 4a61fd2973a0c3993fb50f8d931e5baf131afb40b9a82bde626bca3438cf2653
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though garbled, contains a URL that matches the malicious redirector, suggesting the document's primary purpose is to trick the user into visiting this malicious site. The presence of numerous links, many hosted on Shopify, indicates a link farm or SEO poisoning attempt to drive traffic to malicious destinations.

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=puchd+date+sheet+2019+revised
    • http://lujorito.sweetelegance.ca/uploads/1/3/0/7/130738542/nurewisoseteb_jibemut_nolexowo_fivevorasak.pdf
    • http://dabunota.stonesoupshakespeare.com/uploads/1/3/1/6/131607600/xopakesonotu_gopixuselaxora_xexalidiketi.pdf
    • http://files.kasl.us/uploads/1/3/0/7/130739621/b22886d44c.pdf
    • http://punenonej.tradergreat.net/uploads/1/3/1/0/131070872/lesoxojarokake.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/ridubuzoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/7626/3841/files/bizidog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/3805705826.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/rojojimunowizededezex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/28016445773.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/98224711367.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/16905327482.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/right_heart_failure_guidelines_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/7501/8662/files/autumn_leaves_jazz_piano_solo_improvisation.pdf
    • https://cdn.shopify.com/s/files/1/0434/1615/8359/files/oxigen_wallet_app_for_pc.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_off0000602a.bin
8a7361dd17abe62e864d99adbd0deb360f21fa26e7e6d4765290736f3e0b196d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602A 5536 bytes
font_01_sfnt_off000072ec.bin
026de1076dad6614fee7b4839f066e743e4238b5ddea94259138cfcd618330b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 2320 bytes
font_02_sfnt_off00007d3e.bin
57b90e2a4993f6aace2aa5f2911af6db1eecec3017f26fe0d072d527ce10b036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3E 14540 bytes
font_03_sfnt_off0000ab34.bin
7a7e0f9cb89785dee93ecfbcc78ef93b5a18a5022886c2d5a0bf15d9412c15a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB34 16224 bytes

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