Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cea6fde48b6b09e…

MALICIOUS

PDF

51.8 KB Created: 2020-08-22 12:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29ee6038fe74bba0f68ba6302af803a SHA-1: a06684065fb4dbf7b6d48348f57e77e1d72c3764 SHA-256: 4cea6fde48b6b09ee3eb1b68d454211ece5f3772ed41d63c68f79a71848f4f2e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to 'acids bases and salts worksheet answers'. The presence of numerous other Shopify links, while some are benign, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. 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.com/pify?keyword=19+acids+bases+and+salts+worksheet+answers
    • http://files.maria-cipriano.com/uploads/1/3/2/8/132814306/kuviwupapemad.pdf
    • http://files.topthispizzacrusts.com/uploads/1/3/2/6/132695829/rujibopatu_pudoruvomenodek_xitujajimaxet_tixoxe.pdf
    • http://dokenopim.allaboutlinda.com/uploads/1/3/2/7/132712615/munejodobikebex-betez-gajodu.pdf
    • http://gazus.platinumfragranceoils.com/uploads/1/3/1/3/131383657/8eaf607ed5ce628.pdf
    • http://files.erlendevensen.com/uploads/1/3/1/3/131379439/8704459.pdf
    • https://cdn.shopify.com/s/files/1/0430/4912/3993/files/windows_8._1_pro_keys_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/didelot.pdf
    • https://cdn.shopify.com/s/files/1/0439/3933/2251/files/4chan_co_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0433/4095/5803/files/16110026210.pdf
    • https://cdn.shopify.com/s/files/1/0437/8820/6238/files/23435824870.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5978/files/lozetatanezaja.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1761/files/97192135350.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8447/files/tatoxor.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1253/files/sheet_silicate_structure_definition.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_off00008262.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8262 2828 bytes
font_01_sfnt_off00008c5d.bin
d6fe659ee14b2df82ac2811c9ed08c0f8a9c6c11408fee2e9603effa5242e838
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5D 5436 bytes
font_02_sfnt_off00009ede.bin
0442d345216f277291bec8780c0381a5e1892bd31bd357cad76b90f7f0f0a118
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDE 10212 bytes