Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b83e3e44f4cbe1b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-14 11:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c812d459c56ad52c0df63b652860cd7 SHA-1: 41d69a4a70c3d0c508fc79d90cf97e6bb8a7fcff SHA-256: 6b83e3e44f4cbe1bf6c69a824acfd547b1bc488fcf80ca8d0164ea683e226c23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known for malicious activity. The document body itself contains a link that appears to be a lure for users searching for PDF manipulation tools, likely to encourage clicks on the malicious links. 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.ru/wb?keyword=add%20image%20to%20pdf%20adobe%20acrobat%20x
    • http://files.nvusdwellness.org/uploads/1/3/1/4/131483685/fajefuzipizusa_simada_vaviwekugakeluz_potavunosa.pdf
    • http://bizuwevob.ashtangayoganorthampton.com/uploads/1/3/0/7/130775045/a283efd.pdf
    • http://sinif.plumasearthdays.com/uploads/1/3/2/6/132680932/filesekaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/english_vocabulary_in_use_advanced_second_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7210/8197/files/56005441141.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/madden_nfl_19_ultimate_team_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/6251/6122/files/11777951283.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/instrumen_penilaian_akreditasi_puskesmas_terbaru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/526428265.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/98349341322.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1219/files/17919785000.pdf
    • https://cdn.shopify.com/s/files/1/0440/6919/1832/files/rajidalofumokax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/kepavedumidibidu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/patad.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2283/files/41782295082.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ace.bin
ed537fd0fcd37544811436535258b1e4c13837e51d8224e111fdf986af64e22b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACE 5144 bytes
font_01_sfnt_off00007c4f.bin
448d6be8bf78cc11f0a6ea15e52bea482a7876b83dd3d3af56663b97e331c49a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4F 9660 bytes
font_02_sfnt_off00009d50.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D50 4324 bytes

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