Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd7c9f550cff445…

MALICIOUS

PDF

48.9 KB Created: 2020-09-01 02:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0055616f80567dc2b6ec247a246157c2 SHA-1: 8a3fa721d7f5545c298c0e536136fec35e061d7a SHA-256: 5dd7c9f550cff445c7bee714b91996659bc67f092f4a57e54c4ad4505fbbe566
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to malicious infrastructure. The document body, though heavily obfuscated, contains text related to "building management system basics pdf" and the malicious URL, suggesting a phishing or scam lure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=building+management+system+basics+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/1cc7e8_2cebfe308a0442fe927734d0c5bf115c.pdf
    • https://static.usrfiles.com/ugd/fe83c3_ac12689296104609b3203450fd7fc6ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_46097ce2206045ce97267481e2a31680.pdf
    • https://static.usrfiles.com/ugd/3aee12_fe1cfc7e93f649a7bd4fa2e9b87af4cd.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/16589082218.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/castrol_atf_dex_iii.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e7907bb8ad34464a06d44978dde9dd4.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_33b4c32a761c44a5a92fe227b2d5feaf.pdf
    • https://static.usrfiles.com/ugd/158fb9_beb69b7b931f496180fa890467f072ba.pdf
    • https://static.usrfiles.com/ugd/9e41f0_e52a14c2b3dd4563b1c1fcf7121291f4.pdf
    • https://static.usrfiles.com/ugd/9c0842_890941ac21fa4c90b4223b3ba24e539c.pdf
    • https://static.usrfiles.com/ugd/9cc572_fbd592a2aefb4c109392f2c489ceecb4.pdf
    • https://static.usrfiles.com/ugd/724bd4_338d6e58917343459a83319fef249b39.pdf
    • https://static.usrfiles.com/ugd/a18aa6_32de64509f684aa6b6141e8f0a25a590.pdf
    • https://static.usrfiles.com/ugd/b8c837_a52dcec19ad449e08cce8e75e85e1561.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_off00007ee1.bin
488062389da78607d2384c7beaeadab49132b089361b70256faeb0cc45ec2049
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE1 5668 bytes
font_01_sfnt_off00009224.bin
7750d2325f4c6f98ebb6d714a7dc0d48bbdff1d21870345079ad440f969ac73b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9224 10692 bytes