Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23fd0ec58fc636b…

MALICIOUS

PDF

39.9 KB Created: 2020-08-14 20:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76bf938f782468b1b88a5fb996bca7e SHA-1: 9e4802eb66e495d7f4bfe0e48d5511b7dc547beb SHA-256: e23fd0ec58fc636ba4df70589335ffcad078297c339073bc5420ee2e31bcf657
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a malicious redirector link that points to 'ttraff.ru', which is flagged as known malicious infrastructure. The document body, though heavily obfuscated, appears to contain the same malicious URL and a large number of other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click the malicious link, likely to download further malware or redirect to a phishing site.

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.ru/pify?keyword=championship+manager+93++full+game
    • http://zujasi.christchurchgptms.org/uploads/1/3/0/8/130814328/1651268.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/5051100735.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/3988/1373/files/dofaxumodas.pdf
    • https://cdn.shopify.com/s/files/1/0438/8870/5688/files/1976_nba_finals.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/66571545813.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/90066486488.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufabolip.pdf
    • https://cdn.shopify.com/s/files/1/0437/5586/4213/files/21125791882.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/dolivepuxober.pdf
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/25616396056.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/52122065988.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_off00005d9c.bin
92fb63b3c3e8d01ca7c3adb0e15dcb5f1ea7014c08846714532a3f88461fdb7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 5540 bytes
font_01_sfnt_off0000704f.bin
f10244454f08f68373f95b5b2257fe1a409d0ae1b2db72f368e3b932ce60a81b
pdf-font-stream PDF embedded font (sfnt) at offset 0x704F 10128 bytes