Malicious PDF — malware analysis report

Static analysis result for SHA-256 53efa4c0ef192ee9…

MALICIOUS

PDF

43.4 KB Created: 2020-10-28 05:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8a4d25f06244a1c1bb213f3ea5a7978a SHA-1: baf367878413a118ad6acacb0874367994cdb3d7 SHA-256: 53efa4c0ef192ee99cd98370332fa90342d459189367a881ec3ab39eda951d29
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, forming a link farm, with one of these links pointing to the known malicious redirector `https://cctraff.ru/strik?keyword=ascribed+status+definition`. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=ascribed+status+definition In PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/3505730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f898884db428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f8bab44a834e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f97006c457f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f897fd01e648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f96c55976314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_5f989e0eb8110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_5f9640423c886.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/tuvufexozarijuwib.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/1a27643b41869.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/2373773.pdfIn PDF document text
    • https://kudojazejugir.weebly.com/uploads/1/3/4/3/134322101/zamubuxir-lutokagudo-nibikezirove.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/1/0484/3654/3656/files/8144703519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4979/3698/files/will_county_recorder_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8885/2632/files/kuwesavokot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8958/9930/files/vizapebevowe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/zufuxudizegedenuluzijam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1942/files/78224284209.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4893/4819/files/rca_universal_remote_control_programming_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7190/4188/files/86696841769.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_off00006c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5B 5112 bytes
SHA-256: 9b785b4614992f6ddd008d3aa980c0bc6dfc84d52d09e7401fef22bea8c966ba
font_01_sfnt_off00007dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC2 10140 bytes
SHA-256: 31d01def39ecb5ddf990927a48c77dc8dccc5047b74bc6c9de45728cf55ab6a0

Open this report in the interactive analyzer, or submit your own file for analysis.