Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be07621b4d13af5…

MALICIOUS

PDF

48.8 KB Created: 2020-07-14 16:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd864dac6497218954b61de32e195814 SHA-1: d4e74ec7650e76ed575f7e82b889fd8b2e6f5cb3 SHA-256: 1be07621b4d13af5b3e0d6ae27134e938687da2f129457c433c4d03fbb1b7ddf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to either distribute malware through a link farm or engage in SEO manipulation to drive traffic to 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/pify?keyword=catalogo+de+ropa+en+ingles+pdf
    • http://files.highwayrobberyvintage.com/uploads/1/3/1/4/131406432/276196.pdf
    • http://files.hollytannercountyclerk.com/uploads/1/3/1/0/131070291/zozigi-xamawojujir-bavuvadinij.pdf
    • http://files.questforreadingsuccess.com/uploads/1/3/0/7/130774977/8628508.pdf
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/gejuxab.pdf
    • http://files.inspirationoftime.com/uploads/1/3/1/4/131454808/lusodexule.pdf
    • http://files.craftofscientificwriting.com/uploads/1/3/1/0/131070751/lotetob.pdf
    • http://files.gaualauf.com/uploads/1/3/0/7/130775192/gikawigadan_mosaga_kiremujijugu_gunejife.pdf
    • http://files.christinecarson.com/uploads/1/3/0/8/130813364/kotubasajigelige.pdf
    • http://files.gocadets.com/uploads/1/3/1/6/131606231/1486098.pdf
    • http://files.gardenclubofyarmouth.org/uploads/1/3/1/4/131453698/zelire.pdf
    • http://files.questforreadingsuccess.com/uploads/1/3/0/7/130774
    • https://junogomi.files.wordpress.com/2020/07/5133423187.pdf
    • https://lavesuv.files.wordpress.com/2020/06/62030171027.pdf
    • https://pezezej.files.wordpress.com/2020/07/4992033836.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/4607295176.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/sabitulobamusakur.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/84365379993.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/funigugipumopewuxonuvuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/fexelelubamabera.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/73423906695.pdf
    • https://cdn.shopify.com/s/files/1/0431/7469/0965/files/58230508667.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/melaliwo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075b0.bin
fbf197ec054fd70dc4b2aa3870c3d33564534a704085741ecbdd36a1fb9e1f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B0 5020 bytes
font_01_sfnt_off000086d0.bin
e2582f8fce4742707d67da117f66b9d65ecf9b83c1eb36427a4d1521260018c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D0 15048 bytes

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