Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca52d0419437b7f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 09:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3cdb091ebe242e0f5b3e4ab55adbdb6 SHA-1: 777eabf0d88d0125c9a1fe26117e8fa2e001fbea SHA-256: 1ca52d0419437b7fa348a76876ef71a4d252261f1307fb2dacea5345676f8bfd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.com/wb?keyword=materi%20prisma%20dan%20limas%20pdf'. This suggests the document is designed to lure users to malicious sites under the guise of providing educational materials. The ML classifier also strongly flagged this PDF as malicious.

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=materi%20prisma%20dan%20limas%20pdf
    • http://bepamem.greenscrub.ca/uploads/1/3/0/8/130814729/135209.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/anyone_anything_someone_something_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/73282087144.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/rusakegifefozexapomenutip.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/90098532850.pdf
    • https://cdn.shopify.com/s/files/1/0433/5140/8799/files/87719159023.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/22326994499.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/25249102453.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/s10_v8_conversion_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/cea_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/63633662477.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_off00005be6.bin
0e86e98db3eaf66dd48acf578be0b3050ca21e555c00318125586d5e6c60e9b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE6 5192 bytes
font_01_sfnt_off00006d7b.bin
b1545c945ad70c958661e7c4cd8cd9e0cbd3421ddf506efcab6fa2456d554b3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7B 10408 bytes