Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1ab6295ce3c239…

MALICIOUS

PDF

44.0 KB Created: 2020-08-07 08:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83990c920952e59acb8385c0cba0801d SHA-1: 374d34e428f9e82af21bc5d2cb138c70fbe987ef SHA-256: 0f1ab6295ce3c23944247c646d83b40f8c62dc18ab150cef615c5dfd3ea8e95f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to learning to tell time, which is then followed by the malicious URL. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm designed to obscure the malicious destination.

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=apprendre+%25C3%25A0+lire+l+heure+pdf
    • http://mamusel.customtattooingbydavid.com/uploads/1/3/1/4/131452821/12adf9.pdf
    • http://files.azioshsfi.org/uploads/1/3/1/4/131406717/6645582.pdf
    • http://lurigazi.threadsofmeaning.com/uploads/1/3/1/4/131437812/9b14556.pdf
    • http://ziril.ejfranklinartloft.com/uploads/1/3/0/8/130814124/kigowilokiki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/lisuluvad.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/8787485960.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/bjt_transistor_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/69289851596.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/wulinudobo.pdf
    • https://cdn.shopify.com/s/files/1/0447/9343/0177/files/self_defense_pressure_points_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/8438/1350/files/50236134487.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/written_argument_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/lelumariposimibodunud.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2769/files/bozisujujubiruvo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0625/2440/files/dekinoperus.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006be8.bin
42c5ff9f6203ecc0b31e67de8fd5f2eeec250e5d4f5fdf30061c8b3a44957f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE8 4964 bytes
font_01_sfnt_off00007cc9.bin
785649737690c5430658c5f0ad7ef1f8f36254250eba130b8ccd2a37df6e5c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC9 11344 bytes

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