Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8bfd8a05b6aee…

MALICIOUS

PDF

36.7 KB Created: 2020-10-30 19:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: a991ec08e21db91cc80e78f534e4b1b4 SHA-1: b58309a9604d414212434efedc73140bef0e9763 SHA-256: 13d8bfd8a05b6aeeb4be63a265aaf424e7fbb0fee6348246e7971abda4417990
194 Risk Score

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.me/123?keyword=minns+water+sports In PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/jesudasa_bidez_misunesamaki_takixezeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f8849cf3d2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5f987c6856a4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5f96290daa5da.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f89a6db742d2.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/fukori_mujobibibowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f8a23f355844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_5f9998096d84d.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000534e.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000534e.bin)
    • https://s3.amazonaws.com/nagev/5423951677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9106cc8-e0ee-4b16-ae69-cf1eff6562cb/58070541008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e713550f-704b-4736-88c8-a0bd26116f82/duzenidekexuripawawu.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/atlas_world_map_free_download.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 extracted file (font_00_sfnt_off0000534e.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000534e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x534E 4876 bytes
SHA-256: 0b1c4940d52e4c2c15411bb4d965b61cf77d65381701b3aa81108020732c5ef2
font_01_sfnt_off00006411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6411 10076 bytes
SHA-256: 59f60fb974ae0ec505b4914739c40778e6bc81564564a674b85fb587711ad0ae