Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81899181e6d8751…

MALICIOUS

PDF

44.4 KB Created: 2020-10-16 07:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c75c6f4e9d75f6ea986641cea7284d3e SHA-1: 754c0835527c59c4cb3583a80c1274b707dd2fde SHA-256: a81899181e6d8751ab1f15451be458e4311469531025ce7b10de7d891887db18
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains, characteristic of a link farm. One of the primary links, 'https://ttraff.club/pify?keyword=modificateur+de+voix+discord+android', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

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.club/pify?keyword=modificateur+de+voix+discord+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87a882281c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f88fe045ad5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f873ecda0cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f89027b3ebc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f871766f159a.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/4918653.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/bebad.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/lawaramabub.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/fipapatezirap.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/8819529.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/logir.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/2697538.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/kokirawapov-zigumujuvo-pomujazakes.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/wamivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a318508d-2da5-45c0-8901-b182c95a451c/40941721568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa3015b-2676-4ea5-a442-9eba2d3008cd/migezebonewatar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7806/2758/files/tobidugopulugejobisifir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8291/7053/files/mwo_faction_play_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7254/0838/files/subokaxujorevoteka.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_off00006bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAD 5116 bytes
SHA-256: 5b2afcae37867cfad63b16204ae48fb48d856dfb41df66f397464ec84511802d
font_01_sfnt_off00007d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D34 11968 bytes
SHA-256: 788bdf6930c6e4657545bdf3792259d129dd890e7f915751e88ea667b969f8ef