Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bbcb61c8b49ebb…

MALICIOUS

PDF

41.1 KB Created: 2020-08-24 00:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbc44cd49e4d3dde13e912fc0528f4c2 SHA-1: dd2d267e92af1ba126bd93d99deac2b421aeb9de SHA-256: b9bbcb61c8b49ebb29b428eafb0db3c8e9491ae10e47ce1a1de72d0327130161
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a 'dna protein synthesis review worksheet' and an embedded URL that leads to the same malicious redirector. The presence of numerous external PDF links, many hosted on shopify.com, suggests a link farm used for SEO poisoning or to obscure the final malicious destination.

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.com/pify?keyword=dna+protein+synthesis+review+worksheet
    • http://fejut.dbptraining.com/uploads/1/3/1/3/131380213/261b36c8.pdf
    • https://cdn.shopify.com/s/files/1/0434/8048/1954/files/67850140298.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/4402/9084/files/abcd_movie_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/xigutad.pdf
    • https://cdn.shopify.com/s/files/1/0464/7888/5032/files/black_eyed_peas_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/8925/5847/files/lenovo_m93p_bios_update.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/32839516472.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7815/files/lighting_busbar_trunking_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/thomas_calculus_13th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/fake_car_insurance_certificate_template.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_off000061cc.bin
68b238f855a2eb7d740e8a38e4bd0e2d00afdf0f12020b2f2a4fb25ccc9fff75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 5192 bytes
font_01_sfnt_off0000738e.bin
a991023a98bcbf8471e3fbc21269b5e82c251cb2cde00d0beea3f59bd2f3086d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738E 10536 bytes

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