Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a5abe56af23f7c…

MALICIOUS

PDF

103.2 KB Created: 2020-09-05 19:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1015db179d17c8815d074b47a6aaaa SHA-1: 69ada547103d967d43ccd1b0e56cb68a5aa9f5c5 SHA-256: 52a5abe56af23f7c37f6c3a670f9a851677b2a47ed809b3cf2e013bf270da4f5
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, https://ttraff.cc/pify?keyword=application+letter+for+agriculture+graduate+pdf, points to known malicious redirector infrastructure. This suggests the document's primary purpose is to lure users into clicking malicious links, likely for phishing or to download further malware.

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.cc/pify?keyword=application+letter+for+agriculture+graduate+pdf
    • https://static.usrfiles.com/ugd/a107db_ed79ab02605c4dd2a4b1c3de69d40822.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b38634a70b48c19a1df0cd97bb2e68.pdf
    • https://static.usrfiles.com/ugd/c1108c_aa8031d470c849b298f16ead71beff2e.pdf
    • https://static.usrfiles.com/ugd/9d66c7_305dd13bf7ce4ed588be71541b6b3ad8.pdf
    • https://static.usrfiles.com/ugd/0049ca_d12ce17d75cb45d5b475d80e7e77ac0e.pdf
    • https://static.usrfiles.com/ugd/8a05ec_37be8e82c6ac4f96ae34e606abf614f9.pdf
    • https://static.usrfiles.com/ugd/1a89c8_2db9b8392e774bb4a2ba12fc644b37ab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0462/1887/0938/files/95130088785.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/tarebumaxusodegadagipolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/swtor_concealment_operative_pvp_guide.pdf
    • https://static.usrfiles.com/ugd/cf79db_9e5f38a502be464db02175a8ae9e4fcf.pdf
    • https://static.usrfiles.com/ugd/3826db_abb6b90caf2a41f198df431aaf178186.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_off00015753.bin
91ad95e1c82ff552c12998727e293d573a45ec6f6fd97bd69231343ac3ce8bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x15753 5136 bytes
font_01_sfnt_off000168dd.bin
676ec7d76a1c87e245c14fc094cb45c4878ab5a3b3a53330b61c7b791f1dcf82
pdf-font-stream PDF embedded font (sfnt) at offset 0x168DD 11076 bytes