Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b9d4b215bfbc8a…

MALICIOUS

PDF

33.6 KB Created: 2020-08-20 02:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31eec897ef8dbdadb6d83804baa743c2 SHA-1: c84721df231d984d8707f4454d8d86c020343680 SHA-256: c7b9d4b215bfbc8abb7b1c37038b8de5d2dcfaf346a2d41636859456b232b4a9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=def+leppard+bed+sheets, which is likely used to redirect the user to further malicious content. The document body contains garbled text but also includes the malicious URL and several other URLs pointing to PDFs hosted on Shopify and other domains, suggesting a link-farming or redirection-based attack. No scripts were extracted from this sample.

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=def+leppard+bed+sheets
    • http://files.harrybrookeweddings.org/uploads/1/3/1/4/131453540/1743006.pdf
    • http://files.memberoftwotribes.com/uploads/1/3/1/3/131383297/xujebikuvelovoz_zijaxasexiwud_bezapawibel.pdf
    • http://files.moveks.org/uploads/1/3/1/4/131437831/niroguxelof.pdf
    • http://xazogi.electrisafebournemouth.co.uk/uploads/1/3/0/7/130775432/motaxomus.pdf
    • http://files.en.hancbass-greaterswiss.com/uploads/1/3/1/6/131636625/1248662.pdf
    • https://cdn.shopify.com/s/files/1/0429/6985/8214/files/ielts_writing_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/change_file_to_word_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/la_biblia_de_estudio_vida_plena.pdf
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/seposuxuba.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/62996853258.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/pufixozepakizubajurore.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/7156079281.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/sideruwapiguzo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/muvuwafamefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/goruvemumiposexerako.pdf
    • https://cdn.shopify.com/s/files/1/0434/0288/7322/files/42110565259.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_off00004617.bin
50c110eaead45c9e755f6da1655bcd2b016a11415928aa079bcdd3c099850f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4617 5268 bytes
font_01_sfnt_off000057f1.bin
9d73d1d93af0d233e9b3e538f552a10bad8fd6e8b1bd6a5f5f5021451bd7c4f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F1 9956 bytes

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