Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bf42a65dcf9353…

MALICIOUS

PDF

45.0 KB Created: 2020-07-19 03:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddc9ccb58ba8b2680898241c1fb0f16a SHA-1: 6bb3ffb515bf9ab14552896ddee130a5622fbab9 SHA-256: c1bf42a65dcf93536890b8f3ef17b32c6d524b4a9a56efa14446993ed1685fa4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'ejercicios para abdomen hombre pdf'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content.

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/wb?keyword=ejercicios%20para%20abdomen%20hombre%20pdf
    • http://files.tubs.ie/uploads/1/3/1/0/131071043/xubas.pdf
    • http://files.doceydandies.org/uploads/1/3/1/8/131856071/7437f17.pdf
    • http://files.coldcountryqueens.com/uploads/1/3/0/7/130775977/ec14415215.pdf
    • https://gikifimawoz.files.wordpress.com/2020/07/53449170128.pdf
    • https://tatikukijo.files.wordpress.com/2020/06/dusozigapokunogades.pdf
    • https://fureduz.files.wordpress.com/2020/06/fogugaduzolofuposun.pdf
    • https://bimirofi.files.wordpress.com/2020/06/77838034940.pdf
    • https://pamowuvesez.files.wordpress.com/2020/06/povinipiderusi.pdf
    • https://zimekenasof.files.wordpress.com/2020/07/39173241501.pdf
    • https://todidup.files.wordpress.com/2020/07/55952994958.pdf
    • https://samuzur.files.wordpress.com/2020/07/67431843244.pdf
    • https://turabiza121509985.files.wordpress.com/2020/07/75246115578.pdf
    • https://limalido.files.wordpress.com/2020/07/30949715488.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/49965791746.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/27297370444.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41078692832.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/73404386489.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9477/files/79016356306.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/6759522714.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/45794191630.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/
    • https://zimekenasof.files.wordpress.com/2020/07/3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007099.bin
b63e37fce426eabe99d0e20b2c994310af4c29f0003f5c5bf07d02d654f6a034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7099 5244 bytes
font_01_sfnt_off00008229.bin
7a854a5166609d572a9dfb018407dbc5aeceac62c2706d6e77ee06ee2d762799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8229 10796 bytes

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