Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a902addbd66c865…

MALICIOUS

PDF

52.8 KB Created: 2020-08-03 06:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c18362da97e861429f9ba68dec1a1958 SHA-1: 61e92d480f47862b81c39ef97b314358b498c945 SHA-256: 1a902addbd66c865c2c571416beb68ec42b128b0c6b7167060a205a0deb486fe
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to changing fonts in Discord, likely a lure to disguise the malicious intent. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=how+to+change+font+in+discord
    • http://files.cobblandmarks.com/uploads/1/3/1/1/131163669/pifaxowa.pdf
    • http://files.windofgreatspirithealing.com/uploads/1/3/1/6/131607131/popuxezabuja.pdf
    • http://files.marketmovesmatt.com/uploads/1/3/0/8/130874629/nuvigure-bufagejiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/bujuwovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5258/files/17022594839.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2430/files/stopping_distance_formula.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/fewemujubufifuxoritimem.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/fafebexuxekokozutifuri.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kaxepetumikikexozifaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/xebusuximidabanesofib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemubowakupupoda.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/63351112732.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/80899899140.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000629c.bin
c65824285a74d8c39a91cdef6ef9d6bac668d2f708a0fdbefa2664ac11e34e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 5240 bytes
font_01_sfnt_off00007355.bin
ef5f7918849416dbc975e1ed1b4c142cffe88ba3b5d14ddef284a3d99d072fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7355 5092 bytes
font_02_sfnt_off000084a1.bin
887529dc47d247ee4e42d3ef88b37bb3dd4f767bb4dc91ded7bd40ac8a9baf1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A1 10412 bytes
font_03_sfnt_off0000a855.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA855 4324 bytes
font_04_sfnt_off0000b617.bin
93e1a3318dce9fe1decdd44531d8562b3309fa4deabeb07577eba180b6eced44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 6104 bytes

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