Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f92ef3989dfc00…

MALICIOUS

PDF

45.9 KB Created: 2020-10-26 11:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b49059ecc90bd1fa469d44261bbe6be SHA-1: 934c2377885428e9685e51604604ddc3b696bf25 SHA-256: c8f92ef3989dfc0069cd049c7fae6bfda3c430b1dbb4f39013f2acbee66e355b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure for "Minion rush hack apk data" and embeds multiple links, one of which points to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and other PDF links, suggesting a link farm or redirection scheme to deliver a payload.

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/123?keyword=minion+rush+hack+apk%252Bdata
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8e4be7eb55f.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_5f8e059527bf8.pdf
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f905a7eb43c7.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/987b21c6b.pdf
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/3417775.pdf
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/7834490.pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/1352889.pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/vewutukonineru.pdf
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/5029091.pdf
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f8d63302a6cb.pdf
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f8f6f84ceb5e.pdf
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5f96670c7c99c.pdf
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f8932f6d53c6.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f8d58e2c84d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1898/3323/files/at_st_lego_manual.pdf
    • https://cdn.shopify.com/s/files/1/0501/9244/9717/files/43861395509.pdf
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/meio_ambiente_download.pdf
    • https://cdn.shopify.com/s/files/1/0502/8023/5193/files/fritadeira_air_fry_saude_philco_manual.pdf
    • https://cdn.shopify.com/s/files/1/0498/2118/8251/files/wurukosaner.pdf
    • https://cdn.shopify.com/s/files/1/0492/4234/1542/files/the_quants_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5502/files/bubeg.pdf
    • https://cdn.shopify.com/s/files/1/0497/5008/1690/files/31026948319.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074aa.bin
fa59266d78afee4da56453c9b75060b11b9244a5e440bc457b2fa15fc1dc2a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AA 5200 bytes
font_01_sfnt_off00008650.bin
24af7d33a2be2cdd55b9f758ebc505ffa14b12a7bd32cfec46a07247577c15b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8650 10576 bytes

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