Malicious PDF — malware analysis report

Static analysis result for SHA-256 588bfcc751db9437…

MALICIOUS

PDF

41.8 KB Created: 2020-10-16 12:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5a40590f38651219531d8c8688a2023b SHA-1: 96b545a384c45850e88021f383f12115fff4173f SHA-256: 588bfcc751db94379d770af703af881d0ee2f70a1836fc5a81155838e699d5a4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to download a malicious application. The document body and embedded URLs suggest a lure related to downloading 'ac market apk uptodown'. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/123?keyword=download+ac+market+apk+uptodown In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f88a78dbf07a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f87003e3a6f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f88f1b78651e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5f89363c6de8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f88d80699d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f890aa5bdff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8726b828da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f870fa7cb40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f893866296be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f875ca10604b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f879c7fdbcd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8731ba78447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8728f00d17b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5f889242b67b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f89528822584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8755e6db94a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f8764622f97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8703c153813.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/1/0431/4277/4938/files/bixujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8529/2225/files/toolwiz_photo_pro_editor_apkpure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7503/1206/files/vonoliraferazevugufaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/files/i_spy_lyrics_skepta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8400/8603/files/scholar_background_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1634/2682/files/problem_set_3_answers_economics.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_off00006514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6514 5196 bytes
SHA-256: 0ec84656cb81bf3d8081545baac51b80d93e9b0e5cff797e6cef127b763e7f83
font_01_sfnt_off000076be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76BE 10276 bytes
SHA-256: 06d256dc71df83471e41268fd910bd3b3e35c82a82b2854399c097f0adbd8c35

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