Malicious PDF — malware analysis report

Static analysis result for SHA-256 1817b59661d60d8b…

MALICIOUS

PDF

44.4 KB Created: 2020-09-06 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 924d559391d094fcc28d45d6f9ca06c3 SHA-1: 657b8f0fec1548387515de463246e039c31a827a SHA-256: 1817b59661d60d8b2706566f74cbb5d1bca48d3ec629e280269cc58366f0110f
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which points to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to website templates. The presence of numerous external PDF links, including one to a malicious redirector, indicates a link farm or redirection scheme designed to lead users to potentially harmful content. 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.club/wix?keyword=free+bootstrap+template+for+company+website
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9c0842_8a68273b261846fb93e50e685282bf93.pdf
    • https://static.usrfiles.com/ugd/c2007e_23bb0e8f1d3f4231a2c350fdfab9ed1b.pdf
    • https://static.usrfiles.com/ugd/db1da1_d5765c9b1db04faa9789aa7e27b0ee6b.pdf
    • https://static.usrfiles.com/ugd/ed2d23_741dcecf5d094e41a9d07e34cf5953cf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/easy_origami_bookmark.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/examples_for_job_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/nixemafilunirepoti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/wingsuit_game_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/32078684158.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/topology_and_geometry_bredon.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_off00006ed9.bin
610f97b5459b4d1717a2bcf548c11cdeb74727cdc908f0899b0bf1fd2b2c46d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 5448 bytes
font_01_sfnt_off00008166.bin
56aceb15a8d136b4f47232cde02c5e953b440b2b2dea90d4d6446b1ea2888709
pdf-font-stream PDF embedded font (sfnt) at offset 0x8166 10396 bytes