Malicious PDF — malware analysis report

Static analysis result for SHA-256 c170b94d0231a40a…

MALICIOUS

PDF

44.7 KB Created: 2020-10-28 21:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c2d42297265be8e93eef8a8911a42c31 SHA-1: 2947aba306aa4d7ec69e920e30cc4a6af2309e73 SHA-256: c170b94d0231a40aa3f76279f26d5acdbf2830f0cafd936f21fd671fb52c1f0d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://ggtraff.ru/123?keyword=google+translate+classic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f89119024a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f97cbc7d40bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5f91f77fc7a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f871b054788d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f9870e54d597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_5f8f6099d6b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f99325fa5596.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/9639692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f8eabe411991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5f9348910e767.pdfIn PDF document text
    • https://fexejolimoti.weebly.com/uploads/1/3/4/1/134131812/gurawuzidadanazaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f89bf5a43652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f8cccff6a985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5f92480a196d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f90a52f27d7d.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/1/0499/9377/7302/files/43658547583.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/clash_of_clans_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2983/7982/files/lojifozupoziziwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658eb78a-2019-4fe7-b862-88c54c9dc703/nalofakimidumix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e857ac59-4353-4b15-9396-86eb689c77b0/poxajev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/zisapojuzamewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b9817e-569b-4e15-94a5-4824efd67e63/jakobewipukaraz.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C91 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00006c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C86 5000 bytes
SHA-256: e92f29d79ed1c1969aff44e5e817f4060fb70cc3fe9ea9c7924a0cd62d242d69
font_02_sfnt_off00007d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D99 12384 bytes
SHA-256: eb0a6a6dd89a404e3a87924d710bbe07f81e62e74ba9cd6569ea3873144b8e75

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