Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e6b190b67b42a6…

MALICIOUS

PDF

51.1 KB Created: 2020-11-01 23:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1c6b26422605dda1127b929ddbbf8f71 SHA-1: 908deebe071eda0664b05d1f53de9969597fad0a SHA-256: 92e6b190b67b42a62556c86f0af8359b116226f4beced4ab2476eeca6b638e9e
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 potentially malicious redirectors or link farms. The document body, though heavily obfuscated, contains URLs that are likely part of a SEO poisoning or link farm attack. 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://ttraff.link/pify?keyword=unidad+1+etapa+2+worksheet+answers In PDF document text
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/lopisuwituk.pdfIn PDF document text
    • https://benukozememig.weebly.com/uploads/1/3/4/4/134480731/2221803.pdfIn PDF document text
    • https://sosegesidor.weebly.com/uploads/1/3/4/4/134465043/803a6c.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/pegifebuxosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1d95c0a-a220-4c09-ae31-388843c0d7ad/vhf_marine_frequencies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4990989-b9db-4f4d-8851-b1acc216fc15/xurulidomovupetumajepeben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bf8396-f378-4544-a469-e26174cc0e7e/9100053719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c5249e-f396-4faa-b3be-45b8c176a7e4/grit_the_power_of_passion_and_persev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953d46dc-f7f7-45b0-b5ce-6e7b9c137e2e/67259891855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e38864-b23c-4d2b-9cbd-0c197e5faf87/guboter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3cf17e-4d65-49de-98e1-437d559dd848/download_free_svg_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0c7685-abb1-4f8f-8522-76699e5499eb/21932504714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14533c20-0aac-439a-b542-827e7d611a0f/fifa_street_4_pc_free_download_windo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D1 5136 bytes
SHA-256: 67ea7c3e2c1057b3f0bc9916244257b4ebfd155bafe6bb07f1caae71d842e59b
font_01_sfnt_off00008958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8958 12272 bytes
SHA-256: 46c1cccf919fbed00620472743b92e540806dabdcc0668d38c15372322e75e16
font_02_sfnt_off0000b18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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