Malicious PDF — malware analysis report

Static analysis result for SHA-256 e092ba814a141465…

MALICIOUS

PDF

33.2 KB Created: 2020-10-31 06:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4e39db8871b47196226ce326202bb61a SHA-1: c0e3869feba1e1c97ca39a1bb248a64b8f0ae843 SHA-256: e092ba814a141465d70840fafe001dc1e48ed0074e3b8aee71a2add1eef964cf
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to redirector infrastructure. The primary redirector URL, 'https://cctraff.ru/aws?keyword=marine+corps+intelligence+reading+list', is flagged as malicious. The document body, though partially corrupted, contains text related to a 'marine corps intelligence reading list' and the malicious URL, suggesting a phishing lure. The presence of multiple external PDF links, including one to 's3.amazonaws.com/mijedusovineti/pengertian_adsorpsi.pdf', indicates a link farm strategy to distribute malicious content.

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://cctraff.ru/aws?keyword=marine+corps+intelligence+reading+list In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/pengertian_adsorpsi.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/48636521909.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/95044920971.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/83372995479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f59ed915-f18a-421c-a6ac-e808d745f381/95526586051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1519/9646/files/hsk_5_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/77070932174.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/tadukovopuba.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/using_capital_letters_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/button_battery_cross_reference.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/skeleton_creek_passwords_book_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e246420-e0f4-496a-901b-26424dac2b62/12443480781.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0853/9805/files/70833170622.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_off00004514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4514 5248 bytes
SHA-256: fe39f7c6df6f5e333102f26506a7e103ee5ba9dd36e76d942e2684ae93fc55bc
font_01_sfnt_off000056ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56FF 9712 bytes
SHA-256: ccc112b1a43802e676f0d46e66f7a055db8c6d55f9d47199c07d9bbeaf4512c0

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