Malicious PDF — malware analysis report

Static analysis result for SHA-256 a824946c9b4190ff…

MALICIOUS

PDF

60.2 KB Created: 2020-11-01 10:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d489fd2684f25ee7ba0c7109e3a3e51b SHA-1: 29b9a2360d5f9a15ec6a9865fe3c6d261623f10b SHA-256: a824946c9b4190ff8a4da20a4dcd78fc96167a99bfb3f68db10daf4435d65811
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://ttraff.com/123?keyword=lazzoni+furniture+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f882b407873b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f8b20834a186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f9d2b13920bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f87b22fcbe1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f89e44ce402b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f91bf44b0452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5f98ce7fa27fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5f8e24fb6c833.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rimepusox/demand_and_supply_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1058/7296/files/59577764299.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/78395254848.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/pekivijiv.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/marathi_barakhadi_writing_practice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/phonics_ch_words_worksheets.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000085e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x85E0 15620 bytes
SHA-256: 6971a3eeaf5af285d19232c40c4a4c5c28827bff997955feca9c11092563cb36
font_00_sfnt_off00007599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7599 4756 bytes
SHA-256: 045404dc512c2213a58151584b90d119e9ac0f952bbe26c922c670db3dc219e9
font_02_sfnt_off0000b097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB097 10616 bytes
SHA-256: 789b00596874edf5179b0aae414da3ef9bff2bbed8a1b43e4991ffc8b98590cb
font_03_sfnt_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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