Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8fdfc3ff8255d3…

MALICIOUS

PDF

66.8 KB Created: 2020-08-18 19:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a057c34184b6c70788a61b47d210021 SHA-1: da00c5e635ef64c37ddd27fa782c27c565273ac6 SHA-256: 0f8fdfc3ff8255d3ae7cfd397e1861b8d788f72f14b1116dd6044b8e770fa026
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=oswaal+guide+for+class+10+english. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which point to Shopify domains hosting other PDFs. The ML classifier also strongly indicated maliciousness. These factors suggest the document's primary purpose is to redirect users to potentially harmful 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=oswaal+guide+for+class+10+english
    • http://files.savemetislighthouse.org/uploads/1/3/1/0/131069789/vemopegeju.pdf
    • http://files.conwayfeedandgarden.com/uploads/1/3/0/7/130739155/45ec9cfe8f.pdf
    • http://zagidi.archivedsanfrancisco.com/uploads/1/3/1/0/131070493/1248407.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/97597648409.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/43117881404.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/92168133711.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/28403683955.pdf
    • https://cdn.shopify.com/s/files/1/0449/7453/8920/files/jahiem_the_makings_of_a_man.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/barivamuwut.pdf
    • https://cdn.shopify.com/s/files/1/0436/9265/4745/files/34924011959.pdf
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/zuwupodazi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3331/0870/files/sufalixak.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/62864308506.pdf
    • https://cdn.shopify.com/s/files/1/0431/4690/3709/files/39316079538.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/buvadorofekiligo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a890.bin
6cfd2496facd7e608c5456e58775b8f93ff1940e4c9a51264eac496327bdc792		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA890 5596 bytes
font_01_sfnt_off0000bba2.bin
7d92ccd7a7cf4f4d1d0ad7ecd5e79c3d4fffae22d80265c7120cba43889afc57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 14028 bytes
font_02_sfnt_off0000e7a4.bin
552e926f59ef53231249b6015cc51882b512f7a40c6b17c25f707dc25a221893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 16368 bytes

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