Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd736a42a49b9fd…

MALICIOUS

PDF

46.5 KB Created: 2020-08-11 14:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f21e4b5c7d4d509324528c01a6e4e178 SHA-1: 22b6fae4df3a192e3acaf03909f964aa88c016a5 SHA-256: dfd736a42a49b9fde8e2b88d3937f2619455cade42f3c2ecc7ab63dca273c263
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'online voting system project report in php pdf', likely a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure via the embedded link.

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=online+voting+system+project+report+in+php+pdf
    • http://files.ourladysyork.org.uk/uploads/1/3/1/4/131438190/nuxikemasubup.pdf
    • http://files.kevinanthonyhull.com/uploads/1/3/0/8/130874266/9024802.pdf
    • http://files.openroadcandy.com/uploads/1/3/1/6/131636683/1049560.pdf
    • http://vulusi.thecarissafoundation.org/uploads/1/3/0/7/130739227/vidavojebeman.pdf
    • http://files.alexstudio.bg/uploads/1/3/1/1/131164448/875fbb5e4c12d5.pdf
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/gevegutevazoginuwedeji.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/93042469227.pdf
    • https://cdn.shopify.com/s/files/1/0429/3663/1452/files/pezosirobatujoja.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/noxowolukew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/64864396963.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/5384270821.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/zedalif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/sasezotifagenatod.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/besegowumegozijogemelofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/gisowumakewimenefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9669/files/14574712793.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_off000075f0.bin
f048b78e5b4b38e6e71f5203559e219f9a4a9f5e6b7966cd88e57cb7f43bf9ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 5624 bytes
font_01_sfnt_off00008900.bin
6de8eb91b5a39310938bda2e585568f7a17d2c832dab9b74769e21eda08adfac
pdf-font-stream PDF embedded font (sfnt) at offset 0x8900 10560 bytes