Malicious PDF — malware analysis report

Static analysis result for SHA-256 876341826b898bef…

MALICIOUS

PDF

42.0 KB Created: 2020-08-04 14:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdc8016f8457b01b91f6f326a3b0984f SHA-1: 8b9c674ca950aee25a981fbb979a6a95f9e1407a SHA-256: 876341826b898bef36a5f649f7bd6e822121319d2ce1fb247a38a967a208684d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are algorithmically generated and point to known malicious redirectors. The primary malicious URL identified is https://ttraff.cc/pify?keyword=zar+jh+biostatistical+analysis+pdf, which likely serves as a gateway to further malicious content. The document's structure and the presence of numerous external links suggest a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/pify?keyword=zar+jh+biostatistical+analysis+pdf
    • http://tumirar.northpacifictrainingperformanceinc.com/uploads/1/3/0/9/130968921/lakikaguz.pdf
    • http://files.trendyacresboutique.com/uploads/1/3/1/6/131606697/3338019.pdf
    • http://files.tarotartist.net/uploads/1/3/2/6/132681938/8280551.pdf
    • http://files.rotarysanjuanbautista.com/uploads/1/3/2/6/132683142/gexufojiv-xikubijodolexa-lopid-xikaxiwuzemosum.pdf
    • http://files.whitneyswings.com/uploads/1/3/2/6/132681812/rawok-wolutiruberani-kibax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8558/4792/files/29092444820.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/13420310294.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/29899843509.pdf
    • https://cdn.shopify.com/s/files/1/0431/8596/3169/files/79857499047.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/varinisibom.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/piporejikekewunebuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/85984639304.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/zavuwumojepakijub.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/12472453101.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/amino_acids_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2385/7824/files/83007922857.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/frigidaire_refrigerator_manual.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_off0000664c.bin
0ecad032291ce6914ba4ee2ae5888a99e338d1514715d9ab10de87180a228b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664C 5520 bytes
font_01_sfnt_off00007916.bin
b15dfbd02beb0e23ba14ce51a0e9cd7a1ba744c231387bd9cfb6e6b9a51f050f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7916 9980 bytes

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