Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e15123d776d76e8…

MALICIOUS

PDF

39.0 KB Created: 2020-09-01 10:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1af27530dd8f1cf61493b6c7340e29b8 SHA-1: c0147f80ee34afd9edb009a38470a56c9c838474 SHA-256: 9e15123d776d76e886ebf5a86bd7a360e58c303be108ba4a30468ec35d8f949d
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Mickey bottle cap puzzle answers', suggesting a social engineering pretext. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL.

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=mickey+bottle+cap+puzzle+answers
    • https://static.usrfiles.com/ugd/3826db_8dc91cc996fb43d9bd4b2546a9e8e930.pdf
    • https://static.usrfiles.com/ugd/b8c837_be614cb940534a99ba493049139c3711.pdf
    • https://static.usrfiles.com/ugd/353d00_9ae6c7a1f7444e33b60bd3e3deeae306.pdf
    • https://static.usrfiles.com/ugd/5b9a87_19027a05eb6a4cc39774bf664ef190a6.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4488/files/gerilewuderivemubun.pdf
    • https://cdn.shopify.com/s/files/1/0440/3222/9541/files/ginalodakuzasa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/36539995947.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2085/files/rotumibevokizadilun.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/asus_gpu_tweak_2_oc_scanner_guide.pdf
    • https://cdn.shopify.com/s/files/1/0462/7755/8432/files/fozapej.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/calculus_of_variations_forsyth.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/lafivus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/27131023088.pdf
    • https://static.usrfiles.com/ugd/b8c837_110cdc4e145c43fa81540cfe3486b68b.pdf
    • https://static.usrfiles.com/ugd/3f4b99_0a8657ca4fe64913a6670585a3a4544f.pdf
    • https://static.usrfiles.com/ugd/b910ae_a98ad28b034949df96385a0a54145aa2.pdf
    • https://static.usrfiles.com/ugd/b8c837_23de9b25a7244af8b20cabae8e05d6d0.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_off00004c98.bin
fc46ce61509e737d62f30748b4102d262827c06997ca3cac3b94caaa91e8344f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C98 5264 bytes
font_01_sfnt_off00005e9c.bin
a167f402ea4653c4466c6357f9f720688a6de3f5f01d7ff20f964e62a186447a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9C 10080 bytes
font_02_sfnt_off00008122.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8122 4324 bytes

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