Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e85828b0464236…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 22:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daaf786d7417575dcc3a6a523c0214ce SHA-1: 8ada0945a630d7138610f10e2749466bd22c9b1e SHA-256: 84e85828b046423655827772626b6f54b387be872ca24baf8600dc46b79179e9
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, suggesting an attempt to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains the same keywords as the malicious URL, indicating a lure. The presence of embedded URLs and the ML classifier's high confidence score support a malicious verdict.

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/wix?keyword=manualidades+de+reciclaje+para+ni%25C3%25B1os+de+kinder
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/96195888408.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/dogesozakoxodafavatos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0210/0899/files/79304707995.pdf
    • https://cdn.shopify.com/s/files/1/0436/1263/5299/files/tong_hua_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/83981213640.pdf
    • https://static.usrfiles.com/ugd/3b47cb_bc954f3281dd4721923960fc1d3cf985.pdf
    • https://cdn.shopify.com/s/files/1/0431/4418/3970/files/depeluwitezupe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/zimedimomexitefapokitujuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3426/files/lavokeguvegikavalur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/24544776765.pdf
    • https://cdn.shopify.com/s/files/1/0446/1549/9939/files/subject_verb_agreement_exercises_with_answers_for_class_7.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/watovunafasepen.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_off00006444.bin
3dda5b356ab601886cfc8e5ea4a5cc6aaf07c8130ce3dd916ca9e974533ea28b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6444 5424 bytes
font_01_sfnt_off0000768c.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 1800 bytes
font_02_sfnt_off00007f1a.bin
a93781433567f74dfe1f2fa1130bf56be5f4218827e119250d10a336ed07b0d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1A 11680 bytes
font_03_sfnt_off0000a546.bin
4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA546 16164 bytes

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