Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae4ce0b1fc0b0dc…

MALICIOUS

PDF

48.6 KB Created: 2020-07-13 23:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5b018391f1b56bead99e2758e5c2757c SHA-1: 37dddbde7d89b48e8675d31914553bb8875c4312 SHA-256: 5ae4ce0b1fc0b0dc41923754aa73a589111d1332d148487b9f595634e8e06d97
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to create an SEO link farm, with a primary redirector URL pointing to a malicious site. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'worksheet template construction' and the authoring application 'wkhtmltopdf', suggesting a lure for free content that redirects to a malicious URL.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=day%20worksheet%20template%20construction In PDF document text
    • http://files.ioliteraryjournal.com/uploads/1/3/1/3/131379971/wewaweriv.pdfIn PDF document text
    • http://files.pjeterkoleci.com/uploads/1/3/2/6/132681938/f414f68e3faf.pdfIn PDF document text
    • http://files.alisondowell.com/uploads/1/3/0/7/130776888/kifilisozawob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/xixekuxuduref.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/30815212399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59526866216.pdfIn PDF document text
    • https://diwodijuxo.files.wordpress.com/2020/07/zuzabufu.pdfIn PDF document text
    • https://pogivakudura.files.wordpress.com/2020/07/vazezutata.pdfIn PDF document text
    • https://nudademexu.files.wordpress.com/2020/07/17692342069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/wamowawuguxavuxik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/nebibunipuzerija.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/linorupeduwag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17673355306.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/votidolodukixofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tifomev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000813f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x813F 5312 bytes
SHA-256: ffabf7636a212a4349cc227b0c54230c3e38902f4f0c0d27c168f96de8ec90f1
font_01_sfnt_off00009345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9345 10092 bytes
SHA-256: 1845d2da37067f2c3240deffb5af80d195eb07be1305cac293af72b21f2e286f

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