Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7edd022a8d1bc7…

MALICIOUS

PDF

61.2 KB Created: 2020-07-26 21:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf8a12cb1a3d9bb28f3c93995fbf1c2 SHA-1: c55d6e4cf8aff22091c95e16d8ec9b39a72f354a SHA-256: 8f7edd022a8d1bc7c16cd3a5ad30c68e8141c0606d13d5b9d1d659396e7f84eb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary URL points to a redirector service, and another prominent URL leads to a PDF hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests a lure or phishing attempt.

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.ru/pify?keyword=fractions+on+a+number+line+worksheet
    • http://files.womensfundofep.org/uploads/1/3/0/8/130813768/gesanifopudamugufa.pdf
    • http://files.chrisbracebuilders.com/uploads/1/3/0/7/130776484/dafidut_wolisuwesum.pdf
    • http://files.stadiumcrashers.com/uploads/1/3/0/7/130775543/rivuvevovasa.pdf
    • http://files.rsvpvolunteercaregivers.org/uploads/1/3/2/6/132681824/navate.pdf
    • http://files.justsayinvo.com/uploads/1/3/2/6/132695451/gajujusaronemonobej.pdf
    • https://cdn.shopify.com/s/files/1/0436/9835/6392/files/rimujosedugufod.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/27922272326.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/tumolotukasutulagavuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/42210854139.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/rasamenoripibakogitunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5407/0951/files/23731401104.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4455/files/bupezolalopaxetulazadivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/furula.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/42863273517.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/82777965689.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/piligavepuzo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009eb1.bin
eb58bfcb671d03251deb249f1d35d8e6b56384fa4674c27272f4414d7644c206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB1 5172 bytes
font_01_sfnt_off0000b023.bin
f2c89629644a5b8763ebe0f88960870e70656b648ed98091643ac7cf2ed2ee0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB023 9764 bytes
font_02_sfnt_off0000d1b7.bin
64e13322576ebe4b9a20b8efdba1cb2c8bc01163a7c4e1ba1f667a2d7cf8e6df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16116 bytes

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