Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f37db267444da16…

MALICIOUS

PDF

42.8 KB Created: 2020-09-01 06:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a945059405d05d38a1b8000b70b3b41 SHA-1: af3b36d7f45a4e522670721b526802240fc6ea8c SHA-256: 5f37db267444da16100d53209852c7441ad7914daad115b25e01921a7d855021
194 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that suggests a lure for free templates, which is a common tactic for phishing or scam documents. The presence of numerous external links, many pointing to userfiles.com, indicates a link farm designed to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.ru/wix?keyword=clapper+board+invitation+template+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a341ba4002a24a2db20cc92eff796463.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3422a72c41c4987a975ef8e074c7f02.pdf
    • https://static.usrfiles.com/ugd/eb6612_23fce63f19cc4ea593810a3b4056c283.pdf
    • https://static.usrfiles.com/ugd/b8c837_afd4a19d531d4e639cf27f3c338d63bf.pdf
    • https://static.usrfiles.com/ugd/49be48_c4799b27abf9432185cc2fd6204262c2.pdf
    • https://static.usrfiles.com/ugd/f65518_346921c1c2784259a203b70d4793ec55.pdf
    • https://static.usrfiles.com/ugd/735189_c3776302d2744a7089f7c4a009b264db.pdf
    • https://static.usrfiles.com/ugd/9c43ec_00292e8d0d1349a6a01fce0ec1e8dd72.pdf
    • https://static.usrfiles.com/ugd/9e53d4_d0ec9807674545c58e0573800a0393cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2225f8f139b47cc85f535f7f1e173db.pdf
    • https://static.usrfiles.com/ugd/b8c837_6292e7d7a3144f5985abb0f97e89cfc2.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/76324093543.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/31022259137.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/39276763483.pdf
    • https://cdn.shopify.com/s/files/1/0465/4075/1006/files/zazonijifa.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_off0000686d.bin
e5ed7c8fd15676be8e67a1dc5ab457340a8449362d47bd8fdb8cf5461a368325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686D 5116 bytes
font_01_sfnt_off000079bb.bin
7e88bf5857d47b344a095bda2b00f21d4d246969277d077ed1688e6501b7e7ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79BB 10656 bytes

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