Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1c51c8637e1cc7…

MALICIOUS

PDF

39.4 KB Created: 2020-10-25 14:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecbafa5bf6ea0b8b12a907d798a963c1 SHA-1: 58cfb85d14e9775d9b6b67dc40bb5b310e1ca21b SHA-256: 9e1c51c8637e1cc754434dff9e6904f7b6519ca3cce57e47a2e87618398d19f8
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded URLs, many of which are likely part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains obfuscated text and URLs, suggesting an attempt to disguise malicious content.

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://cctraff.ru/strik?keyword=the+unstoppable+force+title
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gafedupeba/46868957721.pdf
    • https://s3.amazonaws.com/vuraradaso/construction_company_business_plan_sample.pdf
    • https://s3.amazonaws.com/wujodibu/hbse_class_12_syllabus_2019-_20.pdf
    • https://uploads.strikinglycdn.com/files/e8351aa7-d687-44b3-bb20-9e3918923906/tavilanuwexixapigaken.pdf
    • https://uploads.strikinglycdn.com/files/1d86172e-47b0-499d-bbfe-47ab5ce69097/tewufijafetevimikit.pdf
    • https://uploads.strikinglycdn.com/files/e8a75574-ba7d-4cf6-a32b-39ddb3b98f57/72221437152.pdf
    • https://uploads.strikinglycdn.com/files/2400f2d9-f278-45be-b208-6de703d1b21c/43485967552.pdf
    • https://uploads.strikinglycdn.com/files/0888efdf-78b0-4326-a0cc-c9c7d742b100/nijizazovabifekuwujosaju.pdf
    • https://cdn.shopify.com/s/files/1/0484/6898/3969/files/54457141130.pdf
    • https://cdn.shopify.com/s/files/1/0428/3950/7100/files/st_thomas_aquinas_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/63613309210.pdf
    • https://cdn.shopify.com/s/files/1/0477/5647/6572/files/jiwedolon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7958/files/tirojipajivuvoja.pdf
    • https://cdn.shopify.com/s/files/1/0434/1651/8805/files/diwidadimimuxawemof.pdf
    • https://cdn.shopify.com/s/files/1/0494/4835/3959/files/michelob_ultra_koozie_near_me.pdf
    • https://cdn.shopify.com/s/files/1/0463/5541/5206/files/zokewudenomezivav.pdf
    • https://cdn.shopify.com/s/files/1/0497/3500/8405/files/25809525251.pdf
    • https://cdn.shopify.com/s/files/1/0483/7847/8743/files/vujuzosokukixowi.pdf
    • https://cdn.shopify.com/s/files/1/0501/6564/5473/files/33935814480.pdf
    • https://cdn.shopify.com/s/files/1/0483/6802/5751/files/disuw.pdf
    • https://cdn.shopify.com/s/files/1/0486/0733/0464/files/92965111735.pdf
    • https://cdn.shopify.com/s/files/1/0478/6280/8742/files/burmese_language_basics.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005abd.bin
09adfc493cd02fbfa6dea12ccd6683a72c96888ecbe14a0c84a7cfb7bb869d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABD 5192 bytes
font_01_sfnt_off00006c58.bin
f8775d94d299b28ce0515419d239b3a43a3567236dd3954e5c55f4600e275753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 10740 bytes

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