Malicious PDF — malware analysis report

Static analysis result for SHA-256 61164bb1559a1643…

MALICIOUS

PDF

44.0 KB Created: 2020-08-07 10:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aee51d91191cbf4933fdb1b2b525a15b SHA-1: 4cb1c7ef81ba86863d0a14931360428679a3d9b2 SHA-256: 61164bb1559a1643ed257f9cf1c58e59eb6e41803d150b52d9049da3847fa61f
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that leads to a malicious redirector. This suggests the document is designed to trick users into visiting malicious websites, likely for phishing or malware distribution.

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/wb?keyword=percentage%20word%20problems%20worksheets%20for%20grade%205
    • http://files.elitementorshop.com/uploads/1/3/1/6/131636655/tekevezotupifug-soril-terozinonagumeb.pdf
    • http://files.fridayharbour.info/uploads/1/3/1/6/131637316/7933170.pdf
    • http://files.campusco-lab.com/uploads/1/3/1/3/131398336/tejegero.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/43561993858.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/simpson_diversity_index.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/zisoxirakipunepepojajajod.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/47508888019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/totadoremagarano.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/dodupap.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/67642875890.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/online_magazine_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6719/6063/files/jimelarilov.pdf
    • https://cdn.shopify.com/s/files/1/0430/3310/0439/files/jetotidakajapoze.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/98820940854.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2086/files/27781923829.pdf
    • https://cdn.shopify.com/s/files/1/0437/8771/4721/files/kudosorefidozigajaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f24.bin
864731fc457403289e08f3a9a627adb4d71d679c1b2e329fc6d071b584a4ec79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24 5732 bytes
font_01_sfnt_off00007288.bin
8e739dc37fc76220f120ba1eeb515a1469938d821aaba287a4075eceb60dae1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7288 9996 bytes
font_02_sfnt_off000094c9.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94C9 4324 bytes

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