Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e198bbc03919ac…

MALICIOUS

PDF

50.3 KB Created: 2020-10-26 09:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7139525154777dee13fd8a5e27a0eae3 SHA-1: 793a62749dbd30285e3d382b28598bc216c83c67 SHA-256: 08e198bbc03919ac8e8aa62cc9cfd7537d08f8907c537eaf6eea2b0c3d7f862f
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 a link farm designed to host SEO spam. One prominent link, disguised as a user manual, directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the link farm structure suggest an attempt to drive traffic to malicious infrastructure.

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.club/123?keyword=skmei+model+1231+compass+watch+user+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f8e3405d31b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f95e3858f773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8754ecd7bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8a46fcc5d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f87b18a90579.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/7774024.pdfIn PDF document text
    • https://debasomi.weebly.com/uploads/1/3/0/7/130739769/5105209.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/kuronidum-sevus.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/wugana.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/ee819.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://cdn.shopify.com/s/files/1/0437/0844/8920/files/85943596787.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9710/4288/files/verbs_of_movement_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1788/2776/files/vinagepokevasakel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9295/9139/files/66980410638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3972/2138/files/math_textbook_grade_7_ontario.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/tagipido.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8712/5910/files/bajokagipegejonag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2174/0443/files/pogil_calorimetry_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5209/5898/files/blackmagic_sdi_to_hdmi_mini_converter_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/kenobetomolidasofezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee7d522-2016-4a67-a05f-768bb7ea695d/desovugesewevulufawak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b71d40-ef52-4ac8-b612-074724aad359/nobigago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685c1ab8-b274-4047-bf62-eb46f8d749d1/85538122716.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000616c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 5920 bytes
SHA-256: 290c0a28d891309be9abbe830becae5a0bacb6e44bf1101b54a01fc5da66cefc
font_01_sfnt_off0000756e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x756E 8204 bytes
SHA-256: 625db66a239ee63e68713c75136a882e956b1ee45108bacd1eb90ed6561a9a82
font_02_sfnt_off00008c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C07 15164 bytes
SHA-256: 18c1734984575ad7e5835d48c98614999222dfd233a67620698ccf08b7ba5470

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