Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8e2fc5568de975…

MALICIOUS

PDF

80.6 KB Created: 2020-11-07 02:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 711f2f6b22509023dbd35d73b370b013 SHA-1: 9de8d1d29ea750cdbee4c4688abd170301d498eb SHA-256: fe8e2fc5568de975623ff34778f2d1a376c63c9b1b3fbee276fd886eff730a88
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at https://cctraff.ru/aws. Additionally, a heuristic flagged the PDF for containing a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. 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://cctraff.ru/aws?keyword=caracteristicas+del+derecho+civil In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fa4e17f037bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_5fa5db358ca2b.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://s3.amazonaws.com/sitok/how_to_duplicate_in_minecraft.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/jexebefereboxuduluropovov.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/light_guide_systems_costs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6ed0f3-9fae-49b5-8b76-d826b934202e/anti_saloon_league_apush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f900749f-d991-4d35-813b-912ffcb6cdb9/30260424641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90a7c50-f1f5-449a-ae5d-5061798d3b00/inca_elementary_school_lists.pdfIn PDF document text
    • https://wanunukine.files.wordpress.com/2020/11/simeon_panda_workout.pdfIn PDF document text
    • https://romekelisefo.files.wordpress.com/2020/11/nitunawikudaremutujozudok.pdfIn PDF document text
    • https://pifakimep.files.wordpress.com/2020/11/fododuxuxinoni.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/35516809497.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/10th_new_syllabus_social_science_volume_2_book_download.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 4792 bytes
SHA-256: 8d96f3e0d5f5383fe352fd71dea3c13808fa3bcd4f91055825bab38c901f519b
font_01_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 11832 bytes
SHA-256: 337ccaabe3fa989f27ddcc69a439bff83cb0b6f466fd671612ee6438e1fe7c02
font_02_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 16076 bytes
SHA-256: ee989ca3c01167a929a766065888a0399def1744bbc45a0f6c3b11f69e640321
font_03_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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