Malicious PDF — malware analysis report

Static analysis result for SHA-256 3440d0826b7e2b5f…

MALICIOUS

PDF

59.9 KB Created: 2020-08-10 16:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8c77ac458a20f42062ab9050638284 SHA-1: 2fa54e1aaf62f59474db0255b74c1acfcf7e0773 SHA-256: 3440d0826b7e2b5f636c08b7e05b8beef5c33ccf4699f8682d24da4632433d0d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL indicates an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains the malicious URL and other PDF links.

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=implicature+and+presupposition+pdf
    • http://files.aperfectmix.ca/uploads/1/3/0/9/130970022/89941b7.pdf
    • http://moguva.pineedgekennel.com/uploads/1/3/0/9/130969472/madaguxo.pdf
    • http://deteboxis.eugeneglassroots.com/uploads/1/3/2/6/132680813/fibawaru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5663/6828/files/ladumoxepusejunafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0317/files/pusixaviku.pdf
    • https://cdn.shopify.com/s/files/1/0429/8519/3621/files/92725612448.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/algebra_and_trigonometry_ron_larson_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6258/1658/files/basic_computer_hardware_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/tivimabud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8048/2967/files/sanafoviz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/raliwomesulomegiwozufuxiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/59739959616.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/53198780066.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3568/files/sri_devi_bhagavatam_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/kexaku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fa4.bin
0105c2fe5321deec6d8b087bc68147ec0a9c2142d614a9a43ba99b1e325f5258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA4 5236 bytes
font_01_sfnt_off0000a14e.bin
97c699275cb54aad54c35a4b707449fdd196c3bc616e81c9c555f146c16b7827		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14E 13164 bytes
font_02_sfnt_off0000cc3e.bin
827d74b2d45d513d68d7806aefb1b50e5578d13d38fad150c928b15c520be705		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 16344 bytes

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