Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1897caf2747e4a…

MALICIOUS

PDF

78.5 KB Created: 2020-08-10 01:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d1f6a3db1f31fe90f80e274c35f43d SHA-1: eb618acd332df80ff208dd91ce381c13b8cddf21 SHA-256: ee1897caf2747e4abe5b0d6c82fb8c98c79c1c7dadeeed82a0111d32262db84f
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.ru/pify?keyword=estrategias+de+aprendizaje+colaborativo+pdf'. This URL is embedded within the document body, suggesting a lure to trick users into clicking it. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, many hosted on Shopify, indicates a link farm strategy to distribute 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.ru/pify?keyword=estrategias+de+aprendizaje+colaborativo+pdf
    • http://files.worldofhello.org/uploads/1/3/0/7/130738501/xefexexujazi.pdf
    • http://files.misterspoor.com/uploads/1/3/1/3/131379622/bonaro-xuwireda-gadotuvigedanu.pdf
    • http://files.meilensteinwein.ch/uploads/1/3/0/9/130969831/4dae2262c200de.pdf
    • http://files.milissweetstogo.com/uploads/1/3/0/7/130738971/7834426.pdf
    • https://cdn.shopify.com/s/files/1/0431/6046/9660/files/blepharoplasty_complications.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/nusodupudavitinururine.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/bibafoladarodiluwagekamen.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/26525161424.pdf
    • https://cdn.shopify.com/s/files/1/0431/9553/1424/files/tosixejapemomumukamotudi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2952/files/pemoxenupesevuriganajafu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/fetom.pdf
    • https://cdn.shopify.com/s/files/1/0437/0792/4635/files/pobamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6487/files/boogie_nights_musical_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/71281458900.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/gopar.pdf
    • https://cdn.shopify.com/s/files/1/0432/8318/5819/files/entrepreneurship_development_calicut_university.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/47153614190.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/mogefurawenuvonelexaxe.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_off0000efef.bin
083c01dc4fd48997779669dc0a457437800e8e5e174bfdb1a9e5f5e5da2c1f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 5604 bytes
font_01_sfnt_off00010328.bin
402a1bf0becf7c7bfdbe1fd082f792fb1ecf43dfb4e5f5a90761647cbce75d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 12096 bytes

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