Malicious PDF — malware analysis report

Static analysis result for SHA-256 315a164831fdc543…

MALICIOUS

PDF

73.8 KB Created: 2020-11-03 11:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 11ff57d273aefed9498afe1c7c89ade7 SHA-1: 1dba1f4baa91bd6f1a4d3761f6a9b7bd5e01c6c1 SHA-256: 315a164831fdc543be7de94f69521e9891a3c2485473f0b3adef870779c1629c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a "BDO leveling guide". The document also functions as a link farm, directing users to numerous other PDFs, likely for SEO manipulation or to distribute further malicious content. The ML classifier 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://ttraff.ru/123?keyword=bdo+leveling+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5f94a2d2c5a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f949c9d4cd7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f8a935f2eb3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388614/normal_5f90b945ebf36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f890c15c6e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5f9e241d61d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5f8e21c712b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8e8176095eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f98afe29da13.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/gawetujalikifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/82093638-4712-47da-b012-d1569f2dcfba/saligowudurazegoxok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5568/4002/files/android_9.1_samsung_j7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3184/4771/files/50002958504.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B6 4620 bytes
SHA-256: de2c5050fd7070b8a6779fd688947cda2a96d960b999540bfc0476af14eaaea5
font_01_sfnt_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000c107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC107 9600 bytes
SHA-256: d01b82017bc9d2aaaf96de9d242779d2efd8ccfa5524fd2d5876079bada1db4a
font_03_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 11644 bytes
SHA-256: 8aa8c3fdc0fa5e1e6a7d212af0ba3487ce6d1c78e40137f12a43624818093b46
font_04_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 16328 bytes
SHA-256: 2b5babdfc2d43053ddfbad343e2d18ac16a0b1a0946a4dc27e69f126a4283f8f

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