Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8b4f251773cca3…

MALICIOUS

PDF

35.0 KB Created: 2020-08-17 10:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cd5fab9b127f16ba8c7855f6b619f2a SHA-1: 3af4a6caddafce16d17aedafe79454a7c6139850 SHA-256: 3a8b4f251773cca31ee732fd54a881af98690c4a2b0e45b13066b2f3e02e874e
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=penguin+readers+level+6+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy to improve search engine visibility for malicious content.

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.com/pify?keyword=penguin+readers+level+6+pdf
    • http://nofufi.astiquesalon.com/uploads/1/3/1/1/131164250/8772431.pdf
    • http://files.dicendipublishing.com/uploads/1/3/1/4/131452872/2719600.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/namita_agrawal_all_odia_bhajan_songs.pdf
    • https://cdn.shopify.com/s/files/1/0443/1986/7036/files/daffynition_decoder_angles_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/business_proposal_format_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/arithmetic_progression_examples.pdf
    • https://cdn.shopify.com/s/files/1/0439/8258/6014/files/bernard_werber_les_fourmis_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/36837766162.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/74893021227.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/administrao_pblica_idalberto_chiavenato.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0438/5954/2176/files/bujumudogidawoxufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/89866996993.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/90223907117.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_off00004a47.bin
52e76037f2179f33fd11941f748eeed17a8e8f4df63488dc5f2bcb3da56c4ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A47 5424 bytes
font_01_sfnt_off00005ccb.bin
a555320e77be39adfe9517903f36857a0e1a199cd018fe9bb4c7d0caee956aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCB 10440 bytes

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