Malicious PDF — malware analysis report

Static analysis result for SHA-256 7027550af79cd02f…

MALICIOUS

PDF

64.9 KB Created: 2020-08-11 13:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 559392930dd8ea345bbc727c71a4aa3d SHA-1: 504eb70654f5025a054a76ab17076620204203ea SHA-256: 7027550af79cd02f32ac9b7a67e18a25c3c67ff85d51b6b4ad41c75b9f38aadb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of these links, https://ttraff.cc/pify?keyword=jspdf+base64+image, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=jspdf+base64+image
    • http://files.the-yard-milkshake-bar.com/uploads/1/3/1/8/131871745/70c57b642.pdf
    • http://files.magillcontracting.com/uploads/1/3/1/0/131070518/sanideto.pdf
    • http://files.scarykustoms.com/uploads/1/3/1/8/131856456/6ca5f183.pdf
    • http://files.dealingwithstuff.com/uploads/1/3/2/6/132682882/debojosuvofeti_zapaxenakew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/43502127924.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/71117398945.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/77998269288.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/66976389493.pdf
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/72452863588.pdf
    • https://cdn.shopify.com/s/files/1/0436/1987/7024/files/14443493897.pdf
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/dieta_cetogenica_50_dias_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/10582508106.pdf
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/gevarogevidi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/characteristics_of_procedural_programming.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_off00006ff9.bin
ea9f7eef646a77c294f18879e5016506dead8bf61cc78a716752177cacdcd782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 14680 bytes
font_01_sfnt_off00009f72.bin
c6ba40cbfb6c0869bbd5634e32f50b2fa90a452ec164143ad66c5de1931733c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F72 5604 bytes
font_02_sfnt_off0000b278.bin
12c1438d10ddbde16299152de194c42e924ee1f632da18906aaf5a8c591ef692		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 14700 bytes
font_03_sfnt_off0000e1e6.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 16036 bytes

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