Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27efc64eb1662ee…

MALICIOUS

PDF

43.7 KB Created: 2020-08-20 06:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7ebe1a63d4127c1962e696742c062a SHA-1: bb379891c06bdc9ed45eb38966e479c60c645a4c SHA-256: c27efc64eb1662ee5ea43a309e09a634f8ffb44703ddd0d12ed16baf78095bd4
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for delivering malware or leading users to phishing sites. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=age+of+empires+2+mac++dmg', suggesting a lure related to game downloads. The presence of numerous other links to Shopify-hosted PDFs, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, further supports a content-driven lure strategy. The ML classifier strongly flagged this PDF as malicious.

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=age+of+empires+2+mac++dmg
    • http://files.sdbvl.com/uploads/1/3/1/3/131384424/14890d01.pdf
    • http://guzila.ourladyofperpetualhelpparish.com/uploads/1/3/2/6/132681746/sunerala_lomozepizewuko_zujufaxabodo.pdf
    • http://files.castlewoodclays.com/uploads/1/3/0/8/130873907/b18a71fa7bc6.pdf
    • http://files.cityplumbingnj.com/uploads/1/3/2/7/132740291/zidojutowus_katugakiwofelij_zegiparax.pdf
    • http://files.cityplumbingnj.com/uploads/1/3/2/7/132740291/zidojutowus_katugakiwofelij_ze
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/gta_iv_triner.pdf
    • https://cdn.shopify.com/s/files/1/0435/0941/6095/files/spanish_language_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/kisabibumexa.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/bilajaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/3_idiots_movie_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0455/4991/2229/files/google_photos_app_android_slideshow.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/34153492156.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/wovoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/lekukavutoxazogunipuxev.pdf
    • https://cdn.shopify.com/s/files/1/0450/9502/6840/files/circular_motion_examples_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/1228/4831/files/punujubovizawogukejoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/lord_byron_biography.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/metetixanovaximozefalov.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_off00006b5d.bin
6ea4968ef51030e7c6354452e06d3abce982443c4b5dc566bc8766516d6412ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5D 5564 bytes
font_01_sfnt_off00007e35.bin
5eadac1d924b5c0190c4bde85e8cc0b16efad24f054f15afda13f162f87e9811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E35 10360 bytes

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