Malicious PDF — malware analysis report

Static analysis result for SHA-256 455d6f4e9f61f07f…

MALICIOUS

PDF

45.9 KB Created: 2020-08-22 13:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37bfb8cc0eb2fb9116fe11f694d53eb5 SHA-1: 8ca45374001927df6825e93a4bb747d1ba393441 SHA-256: 455d6f4e9f61f07f42a7e79783ae4a145931cd9c53e91c8ec1fa491780081179
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though partially corrupted, contains text related to a school report and a URL that appears to be part of a link farm, suggesting a lure to drive traffic or distribute further malicious content.

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/pify?keyword=denbigh+high+school+luton+ofsted+report
    • http://gugimunij.namelesstea.com/uploads/1/3/1/8/131856054/8814e28ef6c004b.pdf
    • http://files.fryeburgwaterdistrict.org/uploads/1/3/0/8/130814611/dilumi.pdf
    • http://juzoto.spirituallyawareparenting.com/uploads/1/3/0/7/130775732/9433595.pdf
    • http://pujad.erinearlywine.com/uploads/1/3/2/8/132815296/622f7c.pdf
    • http://files.allmybees.com/uploads/1/3/0/7/130738568/digubuzexujom.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4791/files/embryology_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/lurifeluzogunepewujisuto.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/xijixevaxuxowowifibu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/pufeminagetuguvu.pdf
    • https://cdn.shopify.com/s/files/1/0451/4365/4565/files/hospital_brochure_design.pdf
    • https://cdn.shopify.com/s/files/1/0435/3399/2085/files/mevefinoxupamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/xigebemadomolevusi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2805/2130/files/artificial_insemination_in_cattle_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0751/5558/files/72349149087.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/synonyms_and_antonyms_worksheets_for_grade_5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aec.bin
2cad5a69bdb0ca08923c376c5ac23253fb10e7314d404753cd7e13201011af1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEC 5348 bytes
font_01_sfnt_off00007d0e.bin
d31ec75b80d3bb73d75597547ce9b0a5202d2aad9ed58fd76e0013996866febd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0E 14792 bytes