Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e4fb6f48e46201…

MALICIOUS

PDF

44.5 KB Created: 2020-10-29 18:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ca73acde8c9c87d7ca3bdb6a04b2b15b SHA-1: b2a5882214bf15a809794c1c6f3fa2751bc0d8d3 SHA-256: b5e4fb6f48e4620161cd3c74015bfc11c6d491c027a36360cedd2fdcebeb1ecc
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector services, indicating a link farm designed to distribute malicious content. The primary redirector URL is https://ttraff.link/123?keyword=sam+x+dean+x+sister+reader, which is flagged as malicious. The ML classifier strongly indicates maliciousness, and the structure suggests a spearphishing attachment used to lure victims into clicking malicious links.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/123?keyword=sam+x+dean+x+sister+reader In PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/vavufogi.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/fonasexejije-mogenuxanizi-kifiziko.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/614497.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/baxeradi-xibotitevute.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f871e95518e1.pdfIn PDF document text
    • https://seranogi.weebly.com/uploads/1/3/4/2/134265977/f2ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_5f97dd4aeec8e.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/ead6775d.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/numubemezenoni_lexujifere.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/4021379.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/1/0501/9146/6686/files/stoichiometry_quiz_2_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa42f2b-65b2-4e78-82b3-c1b3dc3703a9/t_j_maxx_home_stores.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7339/7438/files/napa_wine_country_map.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/opposite_of_always.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/assam_tet_free_guide_book_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 PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7169 5112 bytes
SHA-256: e1904d0a31652aad68cb2f7c759a60ed1d6b51784d1240d8b2db9b882ff1a03a
font_01_sfnt_off000082b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B4 10124 bytes
SHA-256: 741fb90dc82c6d81e15738d17b3e76b354e1affe1bf14fc966a36c3e314de3ac

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