Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c974cbc82858f50…

MALICIOUS

PDF

42.7 KB Created: 2020-08-07 20:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3957ec46dab5e19024407092e6fc7fb SHA-1: 49a81810427fe3ea3028b6d61975060e5e29ab04 SHA-256: 5c974cbc82858f50f0e8de5ab505fb009b0ddc422ad24b758b813a58fcf8ea71
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or algorithmically generated URLs. The primary malicious link identified is https://ttraff.ru/pify?keyword=low+oxalate+diet+spanish+pdf, which is part of a link farm designed to manipulate search engine results or lead users to malicious content. The presence of numerous external PDF links suggests an attempt to distribute further malicious content or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=low+oxalate+diet+spanish+pdf
    • http://jodaduxu.marcellusroyaltyaction.com/uploads/1/3/0/7/130775085/tajarozadavakid_tepixed.pdf
    • http://bujug.donnamoralesactress.com/uploads/1/3/0/8/130874359/9517721.pdf
    • http://xomenawix.thehealingcenterforchildrenfamiliesandadults.com/uploads/1/3/1/3/131383483/3ca5af68528b36.pdf
    • http://files.katelyndiane.com/uploads/1/3/1/3/131384635/bumanowor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/pazusevunekeso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/kojuwugixagubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/austin_community_college_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3223/9528/files/.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/kitelovukoxumu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/fimawojazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61927850068.pdf
    • https://cdn.shopify.com/s/files/1/0428/3603/3695/files/act_apostrophe_practice.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/66217836053.pdf
    • https://cdn.shopify.com/s/files/1/0435/1252/9055/files/nutixabeban.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_off00006644.bin
72825563c4cef4475d49821fa82e297637c46f248e04491fee843718c151f6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 5132 bytes
font_01_sfnt_off000077da.bin
0e76b6f6068b76f99c8f27d8df6da3a92318d228f9d8c93d9652760fd50e4312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DA 11724 bytes

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