Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c40d6b20302f6f8…

MALICIOUS

PDF

48.7 KB Created: 2020-08-23 19:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0b2d65bc706b58093fcce80811a27f5 SHA-1: 68c2a24f2e032293dc566b09b9d7d322351e3f60 SHA-256: 5c40d6b20302f6f86d8344f27e829eb79523034ac370253c6ff475fb7c95ee06
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=equations+of+perpendicular+lines+worksheet'. The document body, though heavily obfuscated, contains this same URL, suggesting it's the primary lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, many of which are to benign Shopify domains, likely to mask the malicious intent. 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=equations+of+perpendicular+lines+worksheet
    • http://levaf.definitivearts.net/uploads/1/3/2/6/132680981/fezujijuziwaxuz-jidajepisarira-fawij-xowitamenako.pdf
    • http://files.thehillchristianfellowship.com/uploads/1/3/1/4/131409017/nazavip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24803542318.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/roots_kunta_kinte_movie.pdf
    • https://cdn.shopify.com/s/files/1/0429/4469/2383/files/kuwifolozowiworoji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1070/1981/files/guxirego.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datofugilasififuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutowoterefabobenovise.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/category_theory_for_computer_science.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/define_instructional_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0431/6604/0224/files/android_root_pc_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9202/files/alchimista_libro.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/gojega.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/49829513267.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e63.bin
946a201d63062c8c6a32353bf9c9ead891ea55b2bac2ae1fc429abaecf6cc9a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E63 5484 bytes
font_01_sfnt_off00009116.bin
e5d27a6a015d7e8a3a77b9e99a9015abf994be390eb34217c9c334be34e5d293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9116 10180 bytes

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