Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a8b6ea30a76b35…

MALICIOUS

PDF

41.6 KB Created: 2020-08-17 15:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959592b094ad46320a3479123d16154f SHA-1: 38e0be7f855277c8f20a660eed2ccd9c7eb32fc5 SHA-256: 19a8b6ea30a76b3588d14b15bb71a6c66afdc425d9872b643d34f859c4a6fb5c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a malicious redirector infrastructure, disguised as a download for 'Biohazard 5 game apk'. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern. No scripts were extracted, but the document's structure and embedded links are indicative of a lure to 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://ttraff.cc/pify?keyword=biohazard+5+game+apk
    • http://files.goldeninnervision.com/uploads/1/3/2/7/132740930/60ba7e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2440/7961/files/vovijadibesekuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/7475/4462/files/sumozepafogigupisi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/47376610926.pdf
    • https://cdn.shopify.com/s/files/1/0446/6851/8563/files/zejekulena.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7308/files/axios_with_formdata.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/bagefojarugivawiti.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/65397840887.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0391/files/lugejar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/saree_blouse_cutting_method.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/26388676162.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/minecraft_forge_1_8_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/complete_scoundrel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/polibewisaviwa.pdf
    • https://cdn.shopify.com/s/files/1/0444/3540/7014/files/ifunbox_ios_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/vupifufuvuwipivelipifave.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056eb.bin
1f0c80e374c15a5849e2717dc54458a86e49047483a33821e54360a37f0921ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EB 5452 bytes
font_01_sfnt_off00006952.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6952 1800 bytes
font_02_sfnt_off000071e0.bin
340bdb2149103a7d034dd7c8e565c50fd18c03c2c8ac38498d23c6916b5dc6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E0 12208 bytes

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