Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdf28dcd060f37b…

MALICIOUS

PDF

53.9 KB Created: 2020-08-17 02:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f89ff25b09003db8981f2de347cc22dd SHA-1: bf53959309666a0b93feabba9f18707ef2374cea SHA-256: 2cdf28dcd060f37b92ed515ed42593f1a4b45c4396c49fff1dc5cb118dd02417
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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.com/pify?keyword=taxonomic+keys+for+plants+pdf
    • http://files.dripdroplover.com/uploads/1/3/1/8/131857364/ddb071a.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7039/files/logovivotilunirezidogigo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6524/4832/files/garbage_guide_to_pokemon_ruby.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/8976014856.pdf
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/jspdf_autotable_header_font.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/doa_ins_azorin.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/wabifopezarerumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6384338271.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5754/files/61629989057.pdf
    • https://cdn.shopify.com/s/files/1/0435/1279/1192/files/nadubuliposopirefosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8285/files/24153911637.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dfd.bin
c1eed2cbf948b073c4b4b0d2695938abf97c0927c8b7fe82116bda38d1ed212a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFD 5272 bytes
font_01_sfnt_off00008fd8.bin
8ae28bd69647a4d2fade1d998e144a851be3807cd41311df0ca5cc95b63ae16a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD8 13640 bytes
font_02_sfnt_off0000bb15.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 4324 bytes