Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfc0408165fee7f…

MALICIOUS

PDF

44.1 KB Created: 2020-08-19 13:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4932a0ebba8cde4d90fd630cc9c37ea SHA-1: 3ec1280935d73b47cb6f415b02f166f2e1bc9774 SHA-256: 7dfc0408165fee7f4187ae257d871cbddbf58fa14dd0710055a8bd736754f348
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a search query related to 'vlookup vba different sheets'. This suggests a social engineering attack aiming to redirect users to malicious content.

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/pify?keyword=vlookup+vba+different+sheets
    • http://rurek.tsaiyicosmetic.com/uploads/1/3/1/8/131856177/sobas_sexazedokupaga_zisew.pdf
    • http://files.elevationmotorsportsca.com/uploads/1/3/1/3/131380299/04aa4398.pdf
    • http://zejiwino.bgcslc.org/uploads/1/3/1/4/131483334/8647314.pdf
    • http://zepeb.remodelingmissionviejo.com/uploads/1/3/1/4/131406390/nixosapod.pdf
    • https://cdn.shopify.com/s/files/1/0448/0329/3346/files/accounting_journal_entries_ledger_and_trial_balance.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0087/files/arabic_calligraphy_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0440/6712/7446/files/jeminigotitadu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4446/8901/files/descriptive_paragraph_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/77651714070.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/25958435687.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/zejedawatitatidod.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d9f.bin
368cb0c415223e2250fd4f0a5e3b962b5ff89dbae7deffd81742f5e934b8ec7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9F 5356 bytes
font_01_sfnt_off00007fd2.bin
d692ae15379c5995abf9114f5cda5e2957d005d86bf7dcfed50548b611a53df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD2 10664 bytes

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