Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b81db9baf691344…

MALICIOUS

PDF

46.1 KB Created: 2020-10-27 13:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29694bcf5c970a5ea8fdb14b6170acd3 SHA-1: 5f35945a55548c1b21ef3180a19f37b53674adb0 SHA-256: 5b81db9baf69134446ef5a2d5b6697ce0e5ebd7ad25c18b3cbd57e9f57be45b5
154 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 redirector infrastructure known to host malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to redirect users to malicious sites, 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://ttraff.link/123?keyword=is+so2+ionic+or+covalent
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8f1ea82130b.pdf
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5f8d035d446b4.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f875fcc99a70.pdf
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5f92c2dd4c39d.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f91de405b28f.pdf
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5f917edc46e1c.pdf
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f88677e70e0e.pdf
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f8abb2e34980.pdf
    • https://cdn-cms.f-static.net/uploads/4403282/normal_5f917efbee906.pdf
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/495735c5c.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/belapigojat.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/saloviganepepi.pdf
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/9309179.pdf
    • https://zitajajelenineb.weebly.com/uploads/1/3/4/5/134512459/4569399.pdf
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f8ff6f3eaab7.pdf
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5f8d1bc9e473e.pdf
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f89e60782b41.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f88545d91563.pdf
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f8dc648efa02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/plyometric_box_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/2856/8471/files/99440206680.pdf
    • https://cdn.shopify.com/s/files/1/0268/7221/7784/files/romeo_and_juliet_folger_edition.pdf
    • https://uploads.strikinglycdn.com/files/3bb23b3a-8a8c-48be-a2e3-87a51a3c8b36/tijebi.pdf
    • https://uploads.strikinglycdn.com/files/e63ba1d4-807a-45ad-bfe2-6122543e1f74/58116218868.pdf
    • https://uploads.strikinglycdn.com/files/c7934239-2cae-4c49-b047-eddc759da928/bevuboje.pdf
    • https://uploads.strikinglycdn.com/files/fe81885c-14c4-41a6-b964-988d7167b4a3/88102060668.pdf
    • https://uploads.strikinglycdn.com/files/77c26cb9-427d-4f96-bac5-0c95c097f1f6/bukowiwurexosiden.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c0.bin
609ff35ff229ffec185418096d4b504a9fe00335a3129bded5072b75288625ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C0 4920 bytes
font_01_sfnt_off00008586.bin
e1607fa87ac6be3d01a9a36817f51678039a9f7cd64990644fd7212376dff2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 10916 bytes

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