Malicious PDF — malware analysis report

Static analysis result for SHA-256 67452ebf1e23bb98…

MALICIOUS

PDF

41.9 KB Created: 2020-08-27 18:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3afb874930b4d069eb33a327eaa19e2 SHA-1: 3b27c4fcc96015148c5a1ad1aa8200667740a3d8 SHA-256: 67452ebf1e23bb988f4097ac78c51bc922ff0af4993ebe1319ba4a47cf18616d
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead the user to a compromised site. The document body, though partially obfuscated, includes the malicious URL and references a repair manual, suggesting a lure for phishing or malware delivery. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=new+holland+489+haybine+repair+manual
    • http://files.edistoislandyouthrec.org/uploads/1/3/1/6/131637308/9369160.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0460/1872/3999/files/89468578632.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/converting_fractions_decimals_and_percentages_worksheet_tes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/25889418617.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/zipujutimebumiduv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/fufijadolugewekusab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2668/4824/files/skripsi_akuntansi_syariah.pdf
    • https://cdn.shopify.com/s/files/1/0431/6158/3776/files/gakukixa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/case_study_houses_elizabeth_smith.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/rakunorupom.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1590/files/elements_of_civil_engineering_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/23949759076.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/6691591479.pdf
    • https://cdn.shopify.com/s/files/1/0459/9912/8735/files/acura_tlx_2015_service_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006308.bin
b6aa7dd6e529fb81393fcb98ee2677f0160809f43f3f483c7852582fb7e191c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6308 5760 bytes
font_01_sfnt_off0000768c.bin
92a31e40965358edaadfe03f0d43bbfe4229b864a97eec77d0f73f2c74df2be5
pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 10384 bytes