Malicious PDF — malware analysis report

Static analysis result for SHA-256 052791618acaf14a…

MALICIOUS

PDF

45.4 KB Created: 2020-08-04 02:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6c164b5af7c2b75be57083f130d86c3 SHA-1: 6ad6426b85793fe265051ebcf7e080348c874bb3 SHA-256: 052791618acaf14af5f5930ca981a560837c1ddca322291d52ac265a9ad87920
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, which is designed to lead users to further malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm used for SEO manipulation or to distribute malware. The ML classifier strongly flagged this PDF as malicious, supporting the observed 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.cc/pify?keyword=aluminum+surface+treatment+pdf
    • http://files.michellexiao.net/uploads/1/3/1/6/131607346/xugex-xotosuzunixovir-kuvareduxifo-fufetatarifu.pdf
    • http://files.frankklohr.com/uploads/1/3/1/4/131438392/091d34.pdf
    • http://files.audacitycoffeeroasters.com/uploads/1/3/0/8/130815277/tevupukufimax-sopemu-niroda.pdf
    • http://files.moonphoenixrising.com/uploads/1/3/1/4/131437775/7301164de57.pdf
    • http://files.cauchonphoto.com/uploads/1/3/1/3/131379540/5469489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/tulovinabetup.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/8006/files/taxonomic_classification_of_plants.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/90182127170.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/vurafukirenudi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0305/files/64813209897.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/bimoxelovetelinuxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1460/files/49674737276.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/87025750305.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/nidufene.pdf
    • https://cdn.shopify.com/s/files/1/0436/2023/7475/files/64318468271.pdf
    • https://cdn.shopify.com/s/files/1/0428/9822/7353/files/49727059933.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/dazuzejopasumulubenet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006874.bin
c4f262fa0cc20808d8f3c78403fbfc4bd34f7a03d50c02f93a227f3e9342e1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6874 5060 bytes
font_01_sfnt_off0000797d.bin
9c6514735a71266ae7fcbd31f7b4e3c2b82fb0a5c9e96ae37a4b5918012e22b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797D 9768 bytes
font_02_sfnt_off00009abf.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABF 4324 bytes

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