Malicious PDF — malware analysis report

Static analysis result for SHA-256 0004911dc6b79d90…

MALICIOUS

PDF

107.6 KB Created: 2020-08-05 15:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: da409106826b2fddfc416deb3fa648c1 SHA-1: 51503d9b4b650451cf7517e12e7aa448d6fbfeb8 SHA-256: 0004911dc6b79d90d25d46386aefe88e2deb009a5bbec31f685b6324750faa7a
194 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. This suggests the PDF is designed to trick users into visiting a malicious site, likely to download further malware or conduct a phishing attack. No scripts were extracted from this sample.

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.com/pify?keyword=ley+anticorrupci%25C3%25B3n+peru+2020+pdf In PDF document text
    • http://files.pumpkinmoon.net/uploads/1/3/1/4/131453252/tamejajoti.pdfIn PDF document text
    • http://files.sgkey.com/uploads/1/3/2/7/132741128/matuto.pdfIn PDF document text
    • http://files.tennisjoopbroens.com/uploads/1/3/0/9/130969505/9737111.pdfIn PDF document text
    • http://files.minigoldendoodlesutah.com/uploads/1/3/0/8/130874480/5515176.pdfIn PDF document text
    • http://files.raeedandsons.com/uploads/1/3/1/3/131398392/fakewasibopi.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/1/0438/4056/9494/files/marozemujejugeli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1393/9101/files/dapetizebek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/makalah_gangguan_metabolisme_lemak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/zamipoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/lezabasotepefojediwupoju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/pufosonutumap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/sagom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/fupokekoloxitojurodemudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/nifironakodibewo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1936/9639/files/woxemufelozifagafixugozu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15939 5392 bytes
SHA-256: 5cbe2e0c92301684ec310e881f6dfb89063e67c302f1eea059aa93193dc3031d
font_01_sfnt_off00016b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B73 17400 bytes
SHA-256: 15871758a57931fa6209e9bbe699127f22776ecc3e2397d037aaa60208787ab9

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