Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba0c92916af727…

MALICIOUS

PDF

51.8 KB Created: 2020-08-31 07:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 54a5d1357ae85b650d25d941c163b0c4 SHA-1: ac90587139ff55232789bd767be36055e2d154e4 SHA-256: 67ba0c92916af7271c1d121deb0fbe3fa8b200bfd2fde2087ad405207dbe3fed
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=need+for+speed+most+wanted+macbook+p In PDF document text
    • http:////instruction-as-to-boot-apps-huong-dan-In PDF document text
    • http://z/tong-hop-as-ung-dung-full-cho-mack-by-jingngok/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78683638278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/fitozegamiroxes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/selenium_chrome_default_directory_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7203/4718/files/fazazivuvozemabosowokulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/wugigom.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c72d4cc9d08e407a96a115c73616bcef.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c1d29e3d5b57467cb733da6a0c7d41b8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b444d4_4d04a54bcd5d4f0589d43b440faed198.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1b8612_fc32e386e3dc4d3c9560b32eba04de68.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e3ff21_aea11b0b3fc046319df5b7a6edde73b5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2389/1618/files/29788108106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/nkjv_faithlife_illustrated_study_bible.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 5276 bytes
SHA-256: bc87610a910bc82635beaa5350676205184d7aef09c33beb6da784af631421b9
font_01_sfnt_off0000699d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699D 1940 bytes
SHA-256: e6d5f4324b168664fd4da9de57cdfa04594fe49627acb40df87ebfa60c8ed5f2
font_02_sfnt_off000072e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E5 14452 bytes
SHA-256: 8c4a7d3d80c7fda9a5253b861eb05c51e8ec302603b3afdb86823523e1cd0be3
font_03_sfnt_off00009b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5F 16464 bytes
SHA-256: 585193462d1721ff3094298bc280f7cc93baa48f1c8c444670956bc8f374babc
font_04_sfnt_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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