Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c8361f48aafc71…

MALICIOUS

PDF

40.1 KB Created: 2020-08-21 14:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f1892c4a29acd3368204fc766c0c321 SHA-1: cd0f7cb4253b624a20d531bcdd60093b5e955ca9 SHA-256: 50c8361f48aafc71cad605fc07dbd6db5c1cef1a19ee3df004b3390610960045
120 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 'https://ttraff.cc/pify?keyword=doubles+to+20+worksheet+pdf'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. The document body, though heavily obfuscated, contains the malicious redirector URL and references to other PDF files, reinforcing the lure.

Heuristics 3

  • 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.
  • 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=doubles+to+20+worksheet+pdf
    • http://wefozana.parishardaghmoydow.com/uploads/1/3/0/8/130814575/bamosilon.pdf
    • http://files.donanddarrell.com/uploads/1/3/1/1/131164399/repufarafegozar_domamonasami.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/causes_of_internet_addiction.pdf
    • https://cdn.shopify.com/s/files/1/0434/0855/6182/files/8154284132.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/gofanubejax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/replace_string_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9484/files/grade_10_12_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/dadotisomokajem.pdf
    • https://cdn.shopify.com/s/files/1/0431/4316/8156/files/cellulolytic_fungi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/jedujojanumepilunolenax.pdf
    • https://cdn.shopify.com/s/files/1/0451/7157/2885/files/kutonilemimajilasexasenis.pdf
    • https://cdn.shopify.com/s/files/1/0437/0418/9096/files/24050811253.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/42504563378.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/40393158501.pdf
    • https://cdn.shopify.com/s/files/1/0431/7210/2308/files/95754221113.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_off00005e89.bin
2a6dc0f1c22801babb661cd6f3f322e64ef9f1de2414e81ab3a75536fff80ccc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E89 5488 bytes
font_01_sfnt_off0000713a.bin
862251e350104cefc916a246abd42bd7401cb4993937133a8da0fc86cd11b7f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x713A 9996 bytes