Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a26a63f28d72d0…

MALICIOUS

PDF

39.4 KB Created: 2020-07-12 12:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5dfce5e21b46a528e27aefba749df6e7 SHA-1: 91fd0889c74564a103576f22dfc4b3b955bf6204 SHA-256: a2a26a63f28d72d0b2a196ac3b921210da462f5e4ccf923e6945cb10833a304d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://ttraff.ru/pify?keyword=ejercicios+valores+del+se+2o+bachillerato+resueltos, is flagged as a malicious redirector. The document body contains garbled text but also includes the same URL and a list of other PDF links, suggesting a coordinated effort to distribute malicious content or engage in SEO poisoning. 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.ru/pify?keyword=ejercicios+valores+del+se+2o+bachillerato+resueltos In PDF document text
    • http://files.mychangingthenarrative.com/uploads/1/3/1/4/131483034/0c8d8d6118b4.pdfIn PDF document text
    • http://files.houseoffinland.org/uploads/1/3/2/6/132696621/26a60c5a668ce.pdfIn PDF document text
    • http://files.synergymhs.com/uploads/1/3/0/7/130776006/d82db0.pdfIn PDF document text
    • http://files.salisburysdachurch.org/uploads/1/3/1/1/131164506/ragiserigepefi-kulonatamu.pdfIn PDF document text
    • http://files.little-childrens-bible-school.com/uploads/1/3/1/3/131380733/guluxe.pdfIn PDF document text
    • http://files.haggere.com/uploads/1/3/1/8/131871894/5056092.pdfIn PDF document text
    • http://files.handhills.ab.ca/uploads/1/3/2/6/132695874/b6655.pdfIn PDF document text
    • http://files.rayconant.com/uploads/1/3/1/4/131406433/b932f67c16e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://buvisiz343164486.files.wordpress.com/2020/07/59732542858.pdfIn PDF document text
    • https://lumuganad.files.wordpress.com/2020/07/27637158274.pdfIn PDF document text
    • https://fipenizetizo.files.wordpress.com/2020/07/2191561019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/remopiwipirevasobewar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/vejitaropoxeko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/28390511351.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_off00005759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5759 5168 bytes
SHA-256: 6d0d62d1f9619b303ee1bd944fc3e1b757bf87866ebf8e06bc3ef4037fbdab01
font_01_sfnt_off00006903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6903 11548 bytes
SHA-256: 8652cb78edcde39cabf2684b20a75abae1e94fca5352f292937db721ffb1f05a

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