Malicious PDF — malware analysis report

Static analysis result for SHA-256 6866bf10d596232d…

MALICIOUS

PDF

55.5 KB Created: 2020-07-09 04:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6383818d76872bc61f8aaa99c6b443da SHA-1: 7867eaf7ff649c70fde2814eb34644fdc7a94c6f SHA-256: 6866bf10d596232d47534e4122eec8386707ef60b8cb85fa102650434f3920c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=protein%20expression%20in%20mammalian%20cells%20pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent.

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.com/wb?keyword=protein%20expression%20in%20mammalian%20cells%20pdf
    • http://files.vivagreb.com/uploads/1/3/1/6/131637034/kimab-sugala.pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.artandroulla.com/uploads/1/3/1/3/131380773/6e51b943ebb202b.pdf
    • http://files.unidadepastoral.com/uploads/1/3/1/4/131437351/195585ef.pdf
    • http://files.pawsacupuncture.com/uploads/1/3/1/3/131379680/xovape.pdf
    • http://files.txpunk.net/uploads/1/3/0/7/130776578/36e3926afd116.pdf
    • http://files.yorkshirefreight.com/uploads/1/3/0/8/130874175/8876c671f962c.pdf
    • http://files.jofreeman.net/uploads/1/3/1/1/131163957/3538255.pdf
    • http://files.fnaq.org/uploads/1/3/0/9/130969944/nivubuluro.pdf
    • http://files.cottagefarmstables.com/uploads/1/3/0/8/130874175/zitogosuviguk.pdf
    • http://files.thewallssager.com/uploads/1/3/0/7/130775846/zofudaxeluzun-vogake.pdf
    • http://files.samhallsport.com/uploads/1/3/0/7/130740054/903c75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://moxijixo678822952.files.wordpress.com/2020/06/93295944528.pdf
    • https://woxolit.files.wordpress.com/2020/06/pomobaxidibuvujuwi.pdf
    • https://wexowugo.files.wordpress.com/2020/06/92091837054.pdf
    • https://nojurax.files.wordpress.com/2020/06/zobamarisilul.pdf
    • https://rawosevatati.files.wordpress.com/2020/07/jolonemosif.pdf
    • https://levejaru304222751.files.wordpress.com/2020/06/45581231562.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78683638278.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.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_off00009ae0.bin
70d255f1d85389544e494d374db3cc27e33f880dd9278616109ea296cf65770e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE0 5160 bytes
font_01_sfnt_off0000ac45.bin
469574dcb713c5c16f5db31ae9b56c0deafbec6fe1f8d949439bc32ed65391b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC45 10564 bytes

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