Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ef868c7a95ffc5…

MALICIOUS

PDF

63.6 KB Created: 2020-09-02 07:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85681078e6eb4c08ecee4b10448c9e98 SHA-1: 7b2879a8f4e3f0c4608067f085268df2f03035fe SHA-256: 71ef868c7a95ffc5430b10b92fd4a9c2ae810f8d9a1381009f21ab35f9a50b71
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The presence of numerous external PDF links suggests a link farm designed to obscure the ultimate destination, likely leading to a phishing page or malware download.

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=adobe+acrobat+apk+full
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/4b874d_aebf990fd37c4defb9e6fd3b6c438ca1.pdf
    • https://static.usrfiles.com/ugd/0511f5_22bf94ab88a14a6ca594a589cee77025.pdf
    • https://static.usrfiles.com/ugd/0a0016_658de5d855914c54b293a7142fd5f85d.pdf
    • https://static.usrfiles.com/ugd/c12414_722c422ec2194de991af198a7ef3ea3e.pdf
    • https://static.usrfiles.com/ugd/9b33c5_a0ebb1523f104d7ebf4ce6de518c333c.pdf
    • https://static.usrfiles.com/ugd/40b9e6_a347e68d1792485193357e58671b1657.pdf
    • https://static.usrfiles.com/ugd/197ed4_2e5c9c0402ee495b8f96c6a9c0e43428.pdf
    • https://static.usrfiles.com/ugd/affb4a_f4f0f42959be45558293c0d2535c744a.pdf
    • https://cdn.shopify.com/s/files/1/0440/4396/0485/files/hypothesis_test_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/33886626798.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2022/files/12686466276.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/nulamofogage.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/66783673816.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/jebalatup.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/45439074565.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4296/files/depelusefofilusapabi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea3.bin
a0b54e0d6c7f357b30ae7c55a1e755f664e4ff4929ddbbe90c5199adbfe89961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA3 4892 bytes
font_01_sfnt_off0000bf61.bin
7992d712d8a04ec49cbca536d4e7c916c492e96fd41b0c17f1f9c467f9428a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 10492 bytes
font_02_sfnt_off0000e30f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 4324 bytes

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