Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c261b5598ced27a…

MALICIOUS

PDF

62.6 KB Created: 2020-08-02 15:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 359e6bf851bc39ae68afd3f267d7efa8 SHA-1: 8d3ead8726b942ea66772db1e86ce6c803837e12 SHA-256: 7c261b5598ced27acbc464a639205038c5b6bc71c940d11777efe75811c2a2aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and also references multiple Shopify URLs, likely part of a link farm. The ML classifier also flagged this PDF as malicious, indicating a high probability of 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=div.+avatar-+3px.+wrapper-+3t9dea
    • http://toluzuv.royboswell.com/uploads/1/3/1/4/131453177/62ae806d976fd.pdf
    • http://files.haywardfitnessfanatics.com/uploads/1/3/0/7/130775174/8e32b317b2c18c.pdf
    • http://files.christiancarlson.com/uploads/1/3/1/4/131438423/pemijupugiworep.pdf
    • http://files.stormvisionhsv.com/uploads/1/3/0/7/130739269/678114.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/tekubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/59314592328.pdf
    • https://cdn.shopify.com/s/files/1/0429/4157/9420/files/76593186858.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/64526237910.pdf
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/zuvuruvodisapikajetizuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/zumirujijezed.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/28227027461.pdf
    • https://cdn.shopify.com/s/files/1/0449/2584/5659/files/turn_off_screensaver_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/ravofarogamusome.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5280/files/vumarakefovejas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0438/8726/3899/files/40020618199.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008809.bin
0b89a8c1169fff16a644b019a620cfd1e782ffe888d7962b86eb514cb716293e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8809 5344 bytes
font_01_sfnt_off00009a69.bin
80d444d32ffd7da7cdeb8c16b7fe79720da2e8c2e902a0ee5acd201cc68a224d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A69 3120 bytes
font_02_sfnt_off0000a6ef.bin
2fcfae865ce3094145bdda09389f5fb26bc266ae71b84ed9c98e923c9d38bfec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6EF 15100 bytes
font_03_sfnt_off0000d6c5.bin
581ab5504cd9586d89a5863901948651ab489b38936f5d37af971ca4652d0d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16312 bytes

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