Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c195f54f52fef7…

MALICIOUS

PDF

54.5 KB Created: 2020-08-09 11:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a8d73927cc5a428191133220c39e761 SHA-1: 744ada37eef71b77764f7c5629368844a5a79d04 SHA-256: 17c195f54f52fef7e4799cc16efae57c74032bc46c4c28e5ffb3ce531bc63774
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also features a large number of external PDF links, suggesting a link farm for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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/pify?keyword=human+body+anatomy+in+tamil+pdf
    • http://vefef.intlbob.com/uploads/1/3/1/4/131407089/dudediwu.pdf
    • http://files.hadadithaimassage.com/uploads/1/3/1/6/131606011/lanoxoj.pdf
    • http://files.qldenergyexhibitioncentre.com/uploads/1/3/1/4/131437222/f01e8453ba3fcc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/nigewagowejabadibaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/5787697920.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/apprendre_le_franais_en_s_amusant.pdf
    • https://cdn.shopify.com/s/files/1/0434/4945/0661/files/fujosigufupifodutesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/lorojib.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/2249996988.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/vapira.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2014/files/muslim_girl_names_with_meaning_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7274/1791/files/ximanomus.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/ketiridijuwugoxewoximader.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2867/files/wenodewoso.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/17439247906.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/piviwalesojeganej.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_off0000983f.bin
51d7401b0e59e9c9192f92bb7440224c973250c1db3a03786500cf864144ae3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983F 5116 bytes
font_01_sfnt_off0000a998.bin
66fa0cd0ca2478b42f3bb91e615c902e6566651a6e6ed105c10f3d0a88c11479		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA998 10336 bytes

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