Malicious PDF — malware analysis report

Static analysis result for SHA-256 38876af197e785e4…

MALICIOUS

PDF

54.4 KB Created: 2020-10-29 02:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48b2e5abe5f2813eb89f9d1a86297cb5 SHA-1: 56204fbff9e5256784f7847b2ad9eeb9d762bdf8 SHA-256: 38876af197e785e4501706cdc6bf4e38517c18cabd82f35170e5f7812e49de94
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the embedded URLs, 'https://ggtraff.ru/aws?keyword=marine+ecosystem+plants', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL.

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://ggtraff.ru/aws?keyword=marine+ecosystem+plants
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdf
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f89c62a6895a.pdf
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/6506817.pdf
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f955b4250a20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7beff7b7-3d98-4dd6-8efd-8fdc8268b169/zudisekemesaxusukupefod.pdf
    • https://uploads.strikinglycdn.com/files/94978a89-1a91-49f4-ae79-ffb5cf2a2184/a_tale_of_two_cities_worksheet_answe.pdf
    • https://uploads.strikinglycdn.com/files/7c398621-de41-4f7e-b1cb-bc47bf581f37/22301543008.pdf
    • https://cdn.shopify.com/s/files/1/0501/3474/5253/files/35684659762.pdf
    • https://s3.amazonaws.com/zirojopemup/indian_calendar_2015_with_holidays_and_festival_download.pdf
    • https://uploads.strikinglycdn.com/files/4524b329-ab83-42f3-aab4-de927d0e8222/tefajejuradapifik.pdf
    • https://uploads.strikinglycdn.com/files/d5d271c3-4335-47b5-a6b4-21af88ece8cf/sarewupevaburu.pdf
    • https://uploads.strikinglycdn.com/files/5fa07d96-25c4-4a68-abff-519e286c8576/bodunanikazopevejur.pdf
    • https://s3.amazonaws.com/pozokimepe/wisorunugapuzigerosojarix.pdf
    • https://cdn.shopify.com/s/files/1/0499/8837/0582/files/17723381229.pdf
    • https://uploads.strikinglycdn.com/files/b25bbbcf-83ed-4511-8ca8-9baf45782b8f/wofeligemisuviduw.pdf
    • https://cdn.shopify.com/s/files/1/0437/2342/3912/files/93907920731.pdf
    • https://s3.amazonaws.com/solonebosop/abyssinian_crisis.pdf
    • https://s3.amazonaws.com/xojafemori/banalit_du_mal_arendt.pdf
    • https://uploads.strikinglycdn.com/files/b75dab45-29d0-44b0-b749-1a074a5c78f8/zazazubinibavawelivenek.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_off00009279.bin
98fa1e72c60dbf7ba3d5b6d625d06b8d15f9783a6b58276345b6b0fd8492e8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9279 5188 bytes
font_01_sfnt_off0000a41a.bin
3facdf8bc4ba98c96d04b2e1f4817830b949a5f877af60e43a164a1e394f94a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA41A 12372 bytes

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