Malicious PDF — malware analysis report

Static analysis result for SHA-256 387a63a2861a6ce7…

MALICIOUS

PDF

36.0 KB Created: 2020-08-10 17:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b37db4f6535af556ff045b5edb079c8d SHA-1: 97d9dc3e56873b13cd65a113d938abfc46ebfd98 SHA-256: 387a63a2861a6ce79223eed599de9b7684478437a88ac253b161b45c7688c22c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link that redirects to a known malicious infrastructure, likely as part of a phishing or SEO spam campaign to distribute further malware. The document itself is crafted to appear as a free download lure, with numerous links pointing to other PDFs hosted on Shopify. The primary malicious indicator is the redirector URL, which is designed to funnel victims to potentially harmful 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://ttraff.cc/pify?keyword=corazon+diario+de+un+ni%25C3%25B1o+pdf+espa%25C3%25B1ol In PDF document text
    • http://files.gobigt.com/uploads/1/3/1/3/131379012/bf33c.pdfIn PDF document text
    • http://rufipotet.leadershippasadena.org/uploads/1/3/1/0/131069934/taniridawa-rowarokinavik-valulixa-motakagup.pdfIn PDF document text
    • http://sunoguje.mhfirstresponse.org/uploads/1/3/2/8/132814930/123f3f15a8589a5.pdfIn PDF document text
    • http://sosuruzil.davidjonesdialogues.com/uploads/1/3/1/8/131871390/4e3cc770c.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/1/0432/7607/5164/files/arens_auditing_and_assurance_services.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/24509964527.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/0129/3461/files/pv_annuity_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/58174231201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3899/6642/files/23867363341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/50519826410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/watch_the_avengers_online_free_megavideo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/kubakutu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/19976966281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/datojivike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/kifubinijakir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/rujibomafite.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/12564494688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/antibody_screening_procedure.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_off00004bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BB4 5204 bytes
SHA-256: 306f3e9b6fc11b4efb2e58bb66a41f2620fc32bf0686e03e5d1c42a3f00ab453
font_01_sfnt_off00005d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D32 10824 bytes
SHA-256: 09c851bd2b29a8d4b30463df3fa13e123dab3b2bd7318d2330606142e2b3ba4a