Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9ca99fbebb1ad3…

MALICIOUS

PDF

52.2 KB Created: 2020-08-13 15:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c8dbd2a690150aa4910006d7386bf4 SHA-1: 7744997aef2839e4ec5688e2017c9ed0d228042f SHA-256: 3c9ca99fbebb1ad3fe65beb29dfbda5b1ce10f0a0fa419e9914cd4c04594c66e
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 one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL https://ttraff.ru/pify?keyword=causae+et+curae+pdf, suggesting a lure to a malicious site. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm designed to attract traffic.

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=causae+et+curae+pdf
    • http://files.writingarguments.com/uploads/1/3/2/6/132683147/6249117.pdf
    • http://files.columbiarivercooperative.com/uploads/1/3/1/4/131437930/454f19dfb972477.pdf
    • http://files.tarjetasyregalosmolonas.com/uploads/1/3/0/7/130739116/3734485.pdf
    • http://files.lisassalonspa.com/uploads/1/3/0/8/130873804/8097881.pdf
    • http://xaluz.razajamiamasjid.org/uploads/1/3/1/4/131438428/sagaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/zaxazageb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/2006_honda_rancher.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/72265080940.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/76029145068.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/tinonuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/apocryphal_books.pdf
    • https://cdn.shopify.com/s/files/1/0447/4509/7365/files/nixezot.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/gebudozasiwebukuvupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/fedevan.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/gevogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/25700249128.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/71954966503.pdf
    • https://cdn.shopify.com/s/files/1/0450/7149/9416/files/tuzelozedezabidorukudo.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_off00007ed4.bin
7325166f9d5a2b1b08da6d3f94845a05ce719353bb8094154108a22f250ca504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED4 4756 bytes
font_01_sfnt_off00008f10.bin
64bb8b7e8d4adb70d2556a68749402fc002f998b1afb469c6b7fb814c5495e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F10 11680 bytes
font_02_sfnt_off0000b58d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB58D 4324 bytes

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