Malicious PDF — malware analysis report

Static analysis result for SHA-256 47583b16b0f121a6…

MALICIOUS

PDF

58.2 KB Created: 2020-09-02 14:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab5296a27c6b59c43a7be716dea559e3 SHA-1: 2cf4210eab1f1a4c53ce85b23a84d8970df95763 SHA-256: 47583b16b0f121a6f604b7578895994257d0aa0f59c642c289c6fc8b8a88ac2e
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=ap+biology+exam+study+guide+pdf'. This redirector is likely used to funnel victims to a phishing page or malware download. The document body, though heavily obfuscated, contains references to study guides, suggesting a lure to trick users into clicking the malicious link. 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/wix?keyword=ap+biology+exam+study+guide+pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3095/files/kotalozumapowejujegiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19490865332.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7531/files/11191432567.pdf
    • https://cdn.shopify.com/s/files/1/0430/8412/0225/files/xusomulenet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/fejemuzinug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1085/files/49733153734.pdf
    • https://cdn.shopify.com/s/files/1/0440/9986/2680/files/76789871778.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/66437457014.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2932/files/windows_7_key_gen.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/classification_of_matter_worksheet_2._9_answers.pdf
    • https://static.usrfiles.com/ugd/7f46b5_fe2c299276004863b64e120acc4acbcd.pdf
    • https://static.usrfiles.com/ugd/e3834b_7bfa8a91e56a46f18454d9bfa3847a4e.pdf
    • https://static.usrfiles.com/ugd/5b604d_8387cd006fd54d519446fcd41b0c0497.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_93a1c2a1b6074a139e026e7c3d1113c2.pdf
    • https://static.usrfiles.com/ugd/f241d9_0534ce30e2c44e32a9d9590849f2fe60.pdf
    • https://static.usrfiles.com/ugd/cb2bed_7feaa5efad4b41a3ad8371e090c90f02.pdf
    • https://static.usrfiles.com/ugd/f3cb45_aa0d8c72938c4e4891f23a94483ee9c7.pdf
    • https://static.usrfiles.com/ugd/fbccce_23067028f1ac47c3ae39590afb1c1022.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_off00009774.bin
e6c8c58694246cb276800d9594791ef6198fbe1e4c0eed25ff25cd8edaa1fc82
pdf-font-stream PDF embedded font (sfnt) at offset 0x9774 5340 bytes
font_01_sfnt_off0000a9b3.bin
49f22387f393d73301148606c31444222bf81207dc615bb0c5dfdb676f30e448
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B3 10572 bytes
font_02_sfnt_off0000cd97.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD97 4324 bytes