Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b79b1cb5f67c932…

MALICIOUS

PDF

49.7 KB Created: 2020-08-30 04:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8b9c1bab28ad82294742e0eb3a51c1b4 SHA-1: 739121dbfb6303bc224aa81bd79c8d0d22135859 SHA-256: 5b79b1cb5f67c932e1d20700f17b50e9c98abe0e7ad72e851a6b6b49ccbc476f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.me/wix?keyword=%25D0%25B3%25D0%25B5%25D0%25B9%25D0%25BC%25D0%25BF%25D0%25B0%25D0%25B4+%25D0%25B4%25D0%25BB%25D1%258F+%25D0%25B0%25D0%25BD%25D0%25B4%25D1%2580%25D0%25BE%25D0%25B8%25D0%25B4+gp-419+%25D0%25BE%25D0%25B1%25D0%25B7%25D0%25BE%25D1%2580 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/48d9a1_3dd773271a4649ce88ee9f0b1f65176d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a771bd_fb70c8125dbc4997bc7c667ec2c07502.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_580575a57c014bba9314d1ad3098713d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/83f04e_4670cf69a6524f57a570d2be343f50d2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/39067053101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8371/9071/files/zatizumewipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/nuxebemexebexewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3164/8663/files/lumberjack_shoe_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/gevoxogawogonapok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/kilenupefuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/vorajavif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8172/8151/files/ludabobawarakujuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/tewakulokagopibodadajuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/6103/9524/files/bose_wireless_bluetooth_speaker_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 6312 bytes
SHA-256: 95cd7716e30b9c4c0abf26fb1ba6ce359f97b8c2bcfb6783806276fd2ffd44f2
font_01_sfnt_off0000734c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734C 14692 bytes
SHA-256: 71f80fb345495174f0e1dedd45f9780f63da1523a5a8ff46e623c0f8e0033670
font_02_sfnt_off0000a1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1EE 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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