Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3e0d47190abc80…

MALICIOUS

PDF

41.2 KB Created: 2020-08-13 08:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9c1abe1be7fb722fae6c0150eafab16 SHA-1: a49a46ee11a1bb56d07ac9217ec288d4f84e843b SHA-256: 5b3e0d47190abc803eeb6a88f9b375ade6f22cfcd98de1162961da17d8993f65
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The primary redirector URL is https://ttraff.com/wb?keyword=free%20math%20puzzle%20worksheets%20for%205th%20grade. While the document body text is heavily corrupted, the presence of numerous links suggests a link farm or phishing attempt designed to lead users to malicious sites. No scripts were extracted from this sample.

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/wb?keyword=free%20math%20puzzle%20worksheets%20for%205th%20grade
    • http://files.powersflyfishing.com/uploads/1/3/1/3/131384718/nazalefevesaraxep.pdf
    • http://files.accomplishedteachingny.org/uploads/1/3/1/4/131453465/2143170.pdf
    • http://wunevoxi.shalhevet.ca/uploads/1/3/1/8/131858530/butisolidaruvi_dalolu_wozanujufazonef.pdf
    • http://files.pursuitofyourroute.com/uploads/1/3/2/6/132681443/9ba94e053703fe2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/64873280060.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/rozeviwanaviret.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/bioconversion_enzymatique.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/balawakonozuxumujuwazuta.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/83297620747.pdf
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/american_english_file_5_second_edition_teacher_s_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4081/files/88648286650.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/gajivosarefuli.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/klasifikasi_bunga_telang.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/corporate_identity_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/cctv_camera_training_course.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_off0000611b.bin
d0fffb29f12b2718c3a277800b0c4650c4c25af714a98cbbe218c8999af4a723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 5740 bytes
font_01_sfnt_off0000749e.bin
6c05ada3b83fad34bd5f01f5c53255f37b2f616c0726b76b7c3f361c4324cb10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749E 10372 bytes

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