Malicious PDF — malware analysis report

Static analysis result for SHA-256 21407afc67c6bced…

MALICIOUS

PDF

43.8 KB Created: 2020-07-19 23:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 73e1dadc52076aa37928eca9bcfda49c SHA-1: b73cc231db13ce09895f5b2e23864afebaff8261 SHA-256: 21407afc67c6bcedd0870ebc3592246292c80d651f7635c0f71c69f989920663
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector farm. The document body, though heavily obfuscated, appears to be related to search terms for PDF size reduction, suggesting a lure to trick users into visiting the malicious site. The presence of numerous external links further supports the SEO link farm heuristic.

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.ru/wb?keyword=foxit%20reader%20shrink%20pdf%20size In PDF document text
    • http://files.twangtown.co.nz/uploads/1/3/1/3/131379380/7908405.pdfIn PDF document text
    • http://files.homegrownhighways.com/uploads/1/3/2/8/132814826/dodoluwidinawuba.pdfIn PDF document text
    • http://files.carlisleconcernedcitizens.org/uploads/1/3/1/0/131070912/xuwim.pdfIn PDF document text
    • http://files.samschaus.com/uploads/1/3/1/3/131379543/f206ac6.pdfIn PDF document text
    • http://files.shopthecreditgal.com/uploads/1/3/0/9/130968985/jasaxesufefugereduno.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/1/0431/3274/7927/files/wotenafojulomukesenov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/senokanikuvaxidumiboj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/rewaloz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0016/8607/files/ruzezefux.pdfIn PDF document text
    • https://tanudatekaj.files.wordpress.com/2020/07/sowavegujupo.pdfIn PDF document text
    • https://komebebonize742679635.files.wordpress.com/2020/07/pilosogo.pdfIn PDF document text
    • https://tefaluvutas.files.wordpress.com/2020/06/kinev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/dazonedezesefeposuwulater.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/21900489737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/61939774440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/zebukutizifokuzufipen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71895705060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/kifepomizasara.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_off00006f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F00 5024 bytes
SHA-256: db593ce653e250b20ea5b771422ec8e00da3b81aa7c207d5f6e6339757ad9df7
font_01_sfnt_off00008012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8012 9920 bytes
SHA-256: 8a10f7ff372b4ba266f863bea5e356b98f788f4219ee707f02cd90360d0fb16e

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