Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d23f687e89b43c…

MALICIOUS

PDF

51.3 KB Created: 2020-08-09 06:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b0ac0dae74226200f822a181e20119e SHA-1: cb308edaa6b7e70da28daf78be6fa2c0849babd2 SHA-256: 75d23f687e89b43c5c8980a58b93d311aed35547e020fd34072cfcacd225ffd9
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to 'waltz in c sharp minor chopin pdf'. The presence of numerous external links, many pointing to Shopify, indicates a link farm strategy to obscure the malicious destination.

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.com/pify?keyword=waltz+in+c+sharp+minor+chopin+pdf
    • http://files.captainhorne.com/uploads/1/3/0/7/130739027/wukafaf.pdf
    • http://files.versus.band/uploads/1/3/1/1/131164462/vojisaveli.pdf
    • http://bajezisa.moniquebmx.com/uploads/1/3/1/1/131163599/tokam_pizudiwopivev_sutoj_zofix.pdf
    • http://files.mimiscrafts.com/uploads/1/3/2/3/132303170/fotipajinavakipu.pdf
    • http://ninaki.jamesawatsonjr.net/uploads/1/3/0/8/130874359/fawafebinor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fimovubonivunab.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/descendants_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/22939493097.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/ropevepisovaguxadafosefu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/35877526061.pdf
    • https://cdn.shopify.com/s/files/1/0434/9476/8792/files/manfaat_bayam_merah.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/91616288344.pdf
    • https://cdn.shopify.com/s/files/1/0434/6531/0374/files/88374646540.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/amplificatori_operazionali_esercizi_svolti.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/chromecast_for_mac.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_off00006609.bin
b61a84e97ef81f1a5135e7cd4804db692ef3074af478894d1ed4a2d648d1d0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 5456 bytes
font_01_sfnt_off0000787f.bin
073a1127af9b276c81fbf11682ae4d290fd44774067dcef86c5c513f2645e2da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 16376 bytes
font_02_sfnt_off0000aab2.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB2 16120 bytes

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