Malicious PDF — malware analysis report

Static analysis result for SHA-256 68682baa7f8389a9…

MALICIOUS

PDF

40.5 KB Created: 2020-08-04 17:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf67a5eb49bdffbd375130c5ec97751a SHA-1: 50653e1bd18a2cfaed549023cb2944cda521dc44 SHA-256: 68682baa7f8389a91ffbdf30bbf727b38a6435290176898ff71b1d4ac3676a31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary URL, 'https://ttraff.cc/pify?keyword=electric+actuators+pdf+nptel', is identified as malicious infrastructure. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify and various other domains, suggesting a link farm or content distribution network for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=electric+actuators+pdf+nptel
    • http://japiwi.asturiasmaldonadofoundation.org/uploads/1/3/1/3/131384401/nemonivaxamu_belamaka.pdf
    • http://files.powersresourcegroup.com/uploads/1/3/0/7/130775629/kirajija.pdf
    • http://files.piperfayephotography.com/uploads/1/3/2/3/132303019/4326301.pdf
    • http://files.davidsmothers.com/uploads/1/3/1/3/131382092/subojun-kabudufaxun.pdf
    • http://files.ylhoustonsw.com/uploads/1/3/1/1/131164364/11a9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/66578583635.pdf
    • https://cdn.shopify.com/s/files/1/0435/6400/7583/files/44356949040.pdf
    • https://cdn.shopify.com/s/files/1/0436/2131/8820/files/dekowedosogevisa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/kumexopi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/pulp_fiction_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/70069198523.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4502/files/gebepuwimizadomemudafuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/45325669721.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/48414075245.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/lupanivote.pdf
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/32947663005.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nidosavexurirevinuno.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_off00005ca9.bin
a2b06bdf39a32e511f0666b3c5f9da21c2348239ddb4512ba2e17d74c7119e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 5108 bytes
font_01_sfnt_off00006e1c.bin
a11c673ba673c24f3da2689d2517ce19be3fbc4252bfe0e153fa7d7239610438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1C 12608 bytes

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