Malicious PDF — malware analysis report

Static analysis result for SHA-256 133cb516e36b2c16…

MALICIOUS

PDF

93.7 KB Created: 2020-09-09 11:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e330071e7306fbd29f3d9b68fd6dbd4a SHA-1: 94065224a1c54a33192efd0cedf5406e28e2cab4 SHA-256: 133cb516e36b2c169a451dfa3e6bf5ea07150aa4b0da7ab7581fd831305a1414
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.link/wix?keyword=adecco+singapore+salary+guide+2017', is flagged as a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to salary guides, suggesting a phishing or scam lure. The presence of numerous PDF links, many pointing to benign Shopify URLs, indicates a link farm strategy, likely to obscure the malicious redirector.

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.link/wix?keyword=adecco+singapore+salary+guide+2017
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5930/5877/files/nupodo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/60840460061.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0984/files/international_carrom_rules_and_regulations.pdf
    • https://static.usrfiles.com/ugd/48d9a1_829a091f4b31428099ec2c71d344a008.pdf
    • https://static.usrfiles.com/ugd/fb5067_925406acfa524c238b484066c488870b.pdf
    • https://cdn.shopify.com/s/files/1/0434/2094/2486/files/gapasodebow.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/76872630660.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4012/files/hollywood_actress_hd_wallpapers_1080p.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/xojij.pdf
    • https://cdn.shopify.com/s/files/1/0465/1499/5350/files/37562579946.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/basic_clinical_anesthesia.pdf
    • https://cdn.shopify.com/s/files/1/0434/2598/8757/files/sunure.pdf
    • https://cdn.shopify.com/s/files/1/0451/8114/1143/files/ben_10_movie.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/werefanatazugilotadonijuv.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_off00012325.bin
f130724a910661e5b36d301da89ab65e201b08febfd6c393ec33da89cfaec1cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 5736 bytes
font_01_sfnt_off000136d7.bin
1ceddd409c6d2de3debda5c825ac4359536c4920b68f18fb5f8eb6a4d941a855
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D7 16436 bytes