Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a8eb5539ee6640…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 01:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d908fabce28b26a08910b3dca111141c SHA-1: 26bbf65d26b4fb3f3abdc654440db4fd527df6b7 SHA-256: 82a8eb5539ee664030c028c89fcda2f3c1a875d0764a1061156e71fbea34bfd6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, suggesting an intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=2019%20cars%20with%20manual%20trans
    • http://kulelamur.drinkeuphoriacoffee2go.com/uploads/1/3/2/7/132712093/ff54e7.pdf
    • http://files.laughingnature.com/uploads/1/3/1/8/131856173/ae0db62d9187.pdf
    • http://wujuvatem.leiladyamy.com/uploads/1/3/0/7/130739456/febasetameviguberosi.pdf
    • http://files.gracemotionanddance.com/uploads/1/3/1/4/131437376/8466166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/6328132028.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/avalon_game_cards.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/77473253975.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/golwalkar_books_bunch_of_thoughts.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/92030461359.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/20150036375.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/belasumuvaxibikuluperudu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/zuzivimagorerim.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/burrhus_frederic_skinner_libros.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/47857046952.pdf
    • https://cdn.shopify.com/s/files/1/0436/0028/1762/files/kazoverefiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/4072/6427/files/antonin_artaud_poesie.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/88252053369.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_off00006ec2.bin
b355ccf2df0dd6b7fb398208b584970dec6bc409d1f3ad74216aa0a4295caf7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC2 5516 bytes
font_01_sfnt_off00008167.bin
15b5199018a8cdfdadd2c13af60015943e02bb0135056bb3af723b1fc4ea43e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8167 10428 bytes

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