Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3f8c5e29ca5a89…

MALICIOUS

PDF

35.2 KB Created: 2020-08-04 08:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f49371caf553d369425c392cebdcc1d2 SHA-1: 6b954de35f6610f9bfaae40b769476bcbb3bf765 SHA-256: dd3f8c5e29ca5a896fd5224c9be9f69a8ee42f0c0bfb0543f17e5848ef798235
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a 'world cup printable bracket pdf'. The document body also contains this URL and references the 'wkhtmltopdf' tool, suggesting it was generated programmatically to host numerous links. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wb?keyword=world%20cup%20printable%20bracket%20pdf
    • http://files.legalformsbc.ca/uploads/1/3/1/4/131438348/ruxofi_savurekabiju_xiderenute_vigomu.pdf
    • http://files.englishtheatrecompany32.fr/uploads/1/3/1/3/131384777/9784145.pdf
    • http://files.rpsta.com/uploads/1/3/0/7/130775286/3971419.pdf
    • https://cdn.shopify.com/s/files/1/0444/4097/7574/files/saint_row_2_cheat_code_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/how_to_make_colored_glass_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/44142180827.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/kubukedelonisen.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/resmed_s9_clinician_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gatafuruzakelimosileraji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/meketorefobazonafokakoxam.pdf
    • https://cdn.shopify.com/s/files/1/0437/7251/0362/files/bivitusobesamuvotizunezib.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/wokurir.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0017/files/png_interlaced_or_not.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ca1.bin
287ea0b1d5416b23cc4164c4124ca821795d76263c3dc0de8bbbaa18a2d28bd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA1 5188 bytes
font_01_sfnt_off00005e62.bin
c49048fc3ca04154d962063f2cb013427d91adb1cf705d584b9c25704cde9bc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E62 9860 bytes