Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1c8a83cee07c77…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 22:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bdddfe258ddc99c037d0e5b5c9033ec SHA-1: d33ca8dfd0037be78c52b15e43b7692dc89ab17f SHA-256: 8e1c8a83cee07c77ab5d79d3cfe0dbbf3985f7424fa0a4d352cc61e38dedf441
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=hopewell+township+nj+police+reports'. Additionally, another critical heuristic indicates a PDF link farm with numerous external links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

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=hopewell+township+nj+police+reports
    • http://files.ldsnest.com/uploads/1/3/2/6/132696233/xenogexajonu.pdf
    • http://nuwido.sweet-williams.com/uploads/1/3/0/7/130738885/sipekevegubaluk.pdf
    • http://files.otahnagonlodge172.org/uploads/1/3/2/7/132740584/lukuv.pdf
    • http://files.superhumanflightacademy.com/uploads/1/3/1/4/131407138/zenes-pilep-nefifigifos-ravakaxasuvugaj.pdf
    • http://lejap.kelsey-kane.com/uploads/1/3/0/7/130739625/b8abd618d9.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/employment_news_paper_knowledge_philic.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/los_cuatro_acuerdos_de_la_sabiduria_tolteca.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/tofiketuminuxosapenoxal.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/toxunewofitukaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1778/files/soxudekenasalibamas.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/4249322766.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/refuvawekavulakubosemimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1620/8036/files/gabuviwupaparebumesegosip.pdf
    • https://cdn.shopify.com/s/files/1/0437/2057/3082/files/40518544231.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/3705696.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8639/files/94004763772.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_off000061f0.bin
f28d62d00c7129f1113209bcf4778d96f693cc9c0b708422d7134840399ca30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F0 4940 bytes
font_01_sfnt_off000072c6.bin
ba8dab93bdd03630d1c5cb75281762472f0cc9211a576d27628ba2570309ee39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 10632 bytes

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