Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b477d9d11a40c69…

MALICIOUS

PDF

42.1 KB Created: 2020-08-03 01:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b628b45a7672e21aa9158fe30c5f718 SHA-1: 631f2983cea8643c26b57d15863a7a7e4808613a SHA-256: 7b477d9d11a40c69b7a7d86a093d2e8df90cda5bbe45870890b73227e4c2dc62
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'aquatic biomes worksheet middle school' and the malicious redirector URL, suggesting a lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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/wb?keyword=aquatic%20biomes%20worksheet%20middle%20school
    • http://files.simplybprints.com/uploads/1/3/1/4/131407214/pujivomawuva-wuros-gesupo-lezusuwojadifog.pdf
    • http://files.myvoiceback.com/uploads/1/3/1/4/131452981/faxogenemur_fitakidekiku.pdf
    • http://kifaduv.championhouseofcare.org/uploads/1/3/0/7/130740051/3068032.pdf
    • http://files.stuffanthings.com/uploads/1/3/2/6/132681832/9cb53fa2c6917e.pdf
    • http://files.bigdogrottweilers.com/uploads/1/3/1/4/131406785/kidigiva_wenoso_sudaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/brazil_date_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/read_text_file_into_2d_array_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/0027/2792/files/wepazas.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/tomidikonorulaxupe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/vugetefotadogop.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/ropevepisovaguxadafosefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/15700179496.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/54969616362.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nedodakamilutejevojive.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/windows_7_activation.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/90924031871.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/65697443916.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000659b.bin
5465baf6ad51d93dfd445d2290bddff9cc930329748e3a3ac257fbf4b15239da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659B 5592 bytes
font_01_sfnt_off00007880.bin
6dcd7478bd13e84b5c7d25c95e55354d816ca3e55604cdf0d8216181ac2b3916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7880 10256 bytes

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