Malicious PDF — malware analysis report

Static analysis result for SHA-256 632e8ef62f74c4b0…

MALICIOUS

PDF

47.7 KB Created: 2020-08-24 03:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e2e871d2a2d905292c4868d04c957f6 SHA-1: 7377d3b2dede733282a75ef5a5733da84886489c SHA-256: 632e8ef62f74c4b0bbb0213ff0000ebb2b2f40aa12da5a8fcdb4c9b0ac2202f8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One prominent link directs to a known malicious redirector infrastructure. While no scripts were explicitly extracted, the ML classifier and the presence of numerous external links strongly indicate malicious intent, likely to redirect users to further malicious content or phishing sites.

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=system+functional+requirements+document+template
    • http://sefosire.commonharvestcsa.com/uploads/1/3/0/7/130740563/0841419ef0f.pdf
    • http://pokazok.benmarshallwriter.com/uploads/1/3/1/8/131856772/lovebizo_doxokazisubile_putofezosar.pdf
    • http://ruzade.farmbuddiesonline.com/uploads/1/3/1/3/131383483/sukovenujunijegavi.pdf
    • http://tobuli.eclectic-kids.com/uploads/1/3/0/7/130775795/kakuzifobi.pdf
    • http://files.tncommunitycorrections.org/uploads/1/3/1/0/131069910/5810a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/naxop.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4882/files/calendario_2018_para_imprimir_por_meses.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/nakaxajurowidab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/4956816710.pdf
    • https://cdn.shopify.com/s/files/1/0436/1037/4307/files/43437898721.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/mopisonenukuxexulavumet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/58915618362.pdf
    • https://cdn.shopify.com/s/files/1/0451/1842/3194/files/administrao_financeira_lawrence_gitman.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6315/files/16528280113.pdf
    • https://cdn.shopify.com/s/files/1/0440/6388/3429/files/xoroxarok.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4679/files/xokuwaterurabojojugugekir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/zazekimaw.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_off00005f1b.bin
10e82cd5323437a7f8be911f928476e94f6d2b66270dba0fcfc4e6ac506a3072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1B 5516 bytes
font_01_sfnt_off000071b7.bin
0c45747b5256a47421367d48ebb64f01cb9fea35c9babaa1cac7d1e5c105ce8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B7 16136 bytes
font_02_sfnt_off0000a372.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA372 4324 bytes

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