Malicious PDF — malware analysis report

Static analysis result for SHA-256 400e00722cfb882b…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 07:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f992abbb8430230f145ca96434db24ea SHA-1: 1166f3d6304a18aca7b9b7538d4fe5aa8c66149a SHA-256: 400e00722cfb882bca61c44e941712d7b601748b073267d3256c34b7afcb61be
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, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary redirector URL. The presence of numerous links suggests an attempt to distribute malicious content or phishing lures through a link farm.

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/wix?keyword=guia+roji+cdmx+2018
    • https://static.usrfiles.com/ugd/b8c837_6488a0cfe728435b831603c2fb947484.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0863faa061b443293b9a1a6ff43e43f.pdf
    • https://static.usrfiles.com/ugd/b8c837_31facdb28ae3470c841cfb5e3d84d451.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2b9532331dc4e2fb6faa92178c372c5.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/atkins_40_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0438/0845/6861/files/57944217702.pdf
    • https://cdn.shopify.com/s/files/1/0441/1126/5944/files/45687700475.pdf
    • https://cdn.shopify.com/s/files/1/0438/8978/7048/files/auschwitz_books.pdf
    • https://static.usrfiles.com/ugd/b8c837_f69721c1e91e4e1899830ade4b079143.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb6fe8f978d04fdf9afd989318c2a438.pdf
    • https://static.usrfiles.com/ugd/b8c837_c85ab3223f05432a9a2388f1a977e7db.pdf
    • https://static.usrfiles.com/ugd/b8c837_209cea2bae7245a0a6236b62b357853e.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/first_grade_math_worksheets_free_printables.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/xumugubez.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/xufudugevazaboguzep.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_off000060e2.bin
4d5e2b0f944dab024b69cbd0b425927c012f18f71cb3ee55e9eb00fdb905ee86
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E2 5568 bytes
font_01_sfnt_off000073ca.bin
7e7425ee64e127283f0985e48ae2881eef21828d8370868c1eb5fbcd25d2ea74
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 10340 bytes