Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b130362bd15b01…

MALICIOUS

PDF

43.9 KB Created: 2020-08-08 13:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 924d6ceba352acb27b8d14a69fce1f53 SHA-1: 22eb7af9d82869647a4574284bf47c7dc580601b SHA-256: 38b130362bd15b01b575bdac97dd75d844b77bc2fdd19d8faf7f7331f9c22794
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and embedded links indicate an attempt to lure users to potentially harmful content or manipulate search engine rankings.

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=schooled+gordon+korman+pdf In PDF document text
    • http://files.xrchurch.shop/uploads/1/3/0/8/130874031/a73e6b564eef.pdfIn PDF document text
    • http://kebapob.adsnartspiritwear.com/uploads/1/3/2/6/132695384/gorebemojofija.pdfIn PDF document text
    • http://files.umscorp.net/uploads/1/3/1/4/131454286/tunirovuzar-rotuzegelil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/german_date_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/zezofarozezajizisimido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5081/8969/files/17955853105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/kesaneped.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7882/8700/files/gopro_hero_4_updates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/lidularetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3417/1797/files/buet_admission_question_2020_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6698/1542/files/54869545384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8220/2782/files/wewoxukokavozoxepejuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/16975694112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/gozivenoxokozakolifuwul.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4F 5556 bytes
SHA-256: b7bfbf8a99678b389c5baa362e2e84880913ffc6f36a96c8d85f41bb114c3f6b
font_01_sfnt_off00007d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0A 11196 bytes
SHA-256: 9f91a78a3f5f46f13bff3d847c8c9c368dd2f54803ff98e44448462a4c977c54

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