Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd8a4c9c270c677…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 19:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da563a36d5d54c5c77338f2e1ce38dde SHA-1: 101f91f99335c3f7475edcddd44fa71045f40423 SHA-256: 1cd8a4c9c270c677c9c55f44665e3a70e28450787f4bf149f76c5421317fde6d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, appears to contain text related to a supermarket promotion, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=aldi+s%25C3%25BCd+prospekt+letzte+woche+pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/moxuxexirunukowari.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/39139963217.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/livutulugiwafobo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0615/5173/files/acer_aspire_5740_bios_update.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/59133843561.pdf
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/xilobuzaxegoduko.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/xupizuvulagojanonazutowag.pdf
    • https://cdn.shopify.com/s/files/1/0430/0491/9971/files/permenkes_46_tahun_2020_tentang_akreditasi_puskesmas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/film_genres_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/gold_leaf_sheets_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9866/files/math_worksheets_for_grade_6_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/bisubafobat.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_off00006033.bin
c28c0866db45707e27d7823a26f245d666823c9b4819062f404c06f561ad7f06
pdf-font-stream PDF embedded font (sfnt) at offset 0x6033 5348 bytes
font_01_sfnt_off00007251.bin
1cbd496c254f57741ae874123375b334e97461dfbb07c01aa34c883c6e7cb7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 11160 bytes