Malicious PDF — malware analysis report

Static analysis result for SHA-256 215d4cb228310890…

MALICIOUS

PDF

38.7 KB Created: 2020-08-21 05:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3906864994bce8b15d5f84d530351a07 SHA-1: 8430da7b9991d2bc70e5bf911ad3f5f6ccb0d3f7 SHA-256: 215d4cb2283108902b22355d2e169a927b33a433d45c480c3894f7d37451d220
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL pointing to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though partially corrupted, contains the text 'Astonishia story guide' and the malicious URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to deliver the malicious link.

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=astonishia+story+guide
    • http://marija.alexstudio.bg/uploads/1/3/1/4/131438437/361109f68e7a2.pdf
    • http://xijodemev.danarwellness.com/uploads/1/3/2/3/132302720/zikizojem.pdf
    • http://javewe.petaloudatherapies.com/uploads/1/3/0/8/130874085/0598a4b2587b17f.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/98306153351.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/86624669024.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/19230403559.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/steam_methane_reforming_process_for_hydrogen_production.pdf
    • https://cdn.shopify.com/s/files/1/0436/2865/8848/files/52548406945.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/how_to_delete_time_machine_backups.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_off00005a9e.bin
c449c39c69e8b193c4d84d56417667ce101d5911c4b94beb8e60f7f2a3a1cfb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9E 5144 bytes
font_01_sfnt_off00006c13.bin
3a5a6efebb193f23de799eb6cfcf44540b282a95252589362c3f85dd50a73b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C13 10120 bytes

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