Malicious PDF — malware analysis report

Static analysis result for SHA-256 4920ea0e0541407e…

MALICIOUS

PDF

54.6 KB Created: 2020-08-12 03:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1c5b98ec38d6bb96f0fe0bc5f6803fd SHA-1: 6900258974557a226aca62ba1669875a086a5ba6 SHA-256: 4920ea0e0541407ea45b8ec038914663c343e691e23ce8fb8bdc77b93c6632e8
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, includes the same URL and references 'Bel ami guy de maupassant livre pdf', suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=bel+ami+guy+de+maupassant+livre+pdf
    • http://fuvusimot.timstrings.com/uploads/1/3/1/8/131856772/69c1e7f.pdf
    • http://files.earthartbalance.com/uploads/1/3/1/1/131163667/bojimunedage_nifobakumitig_jeledojupika.pdf
    • http://files.thekingdomiswithin.com/uploads/1/3/2/6/132696104/pevapajekopexo_pobawokuk_robuzaravivizeg_dedowapo.pdf
    • http://riwiwabis.victoriafca.ca/uploads/1/3/1/4/131406799/zotomujetelena_zidokofapalazof.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/womapuzodozexojevewov.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/rijoxekax.pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/xagotoxujupulenuvofo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/sirirewipebubobazagoliw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/11382292761.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8065/files/48898301824.pdf
    • https://cdn.shopify.com/s/files/1/0451/5568/0410/files/advantages_of_maslow_hierarchy_of_needs.pdf
    • https://cdn.shopify.com/s/files/1/0438/5472/5270/files/n_acetil_l_carnitina.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/english_language_proficiency_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/fepifivufanubuge.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/xatolevinukoxol.pdf
    • https://cdn.shopify.com/s/files/1/0436/7423/9129/files/6942615247.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_off0000974b.bin
dc14ef4c734abcade33fa3f8f379713e2a0be5458a1f78d97b33d7962735cbc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x974B 5572 bytes
font_01_sfnt_off0000aa37.bin
3ce88bd9010fa31b34ad90610bb37d4bb8bde9c0139eafbacd607a1ec3342bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA37 10088 bytes