Malicious PDF — malware analysis report

Static analysis result for SHA-256 43649d28e1328429…

MALICIOUS

PDF

46.5 KB Created: 2020-08-07 19:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23786d3b4462903515574a77c8b4b5d0 SHA-1: 77c2c47472e4e96fb059d84752bb5dff8661ab04 SHA-256: 43649d28e1328429dc7e4a4f8d4a21650bb331413f2410a6b0109076a98e8817
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, likely to obscure the malicious redirector. The ML classifier also 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.ru/pify?keyword=bearing+types+and+sizes+chart+pdf
    • http://files.bigkidcollector.com/uploads/1/3/1/6/131637853/1678706.pdf
    • http://sumiwax.ashdownsafetytraining.com/uploads/1/3/0/7/130739664/2290191.pdf
    • http://files.hmclaughlinkolb.com/uploads/1/3/1/4/131453268/de632a02d69b.pdf
    • http://files.srisaiinfotechsolutions.com/uploads/1/3/0/8/130813536/9154222.pdf
    • https://cdn.shopify.com/s/files/1/0435/3330/3976/files/jaduwibeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/jodusixamapowozuwoxetipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/pesozedavasixajezavase.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/gebawuragunefisun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/the_ultimate_guide_to_divination.pdf
    • https://cdn.shopify.com/s/files/1/0435/7645/9422/files/werag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9531/7927/files/access_consciousness_bars_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0430/7550/2234/files/wokubomawovabaji.pdf
    • https://cdn.shopify.com/s/files/1/0434/7360/0678/files/75250173632.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/construction_and_working_of_cfl_lamp.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b8.bin
4ea38d2891d58373f3f09873f1d3d47f25330dceee59d2c2c64d9660013c4df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B8 5264 bytes
font_01_sfnt_off00007ba7.bin
18f5305daf5ff5849c94a12074bbe5b956d097833d300865b8820e0a34a2c8e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA7 10396 bytes
font_02_sfnt_off00009f30.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F30 4324 bytes

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