Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af3ee0ef930a668…

MALICIOUS

PDF

40.6 KB Created: 2020-08-13 11:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe6da501a0372f14ddbc58e4804c6b1 SHA-1: 86614cf0bf8d0386afd10f1653dcd9d06d5e7f52 SHA-256: 9af3ee0ef930a6684e8d7fa6567512d138140930cac9cacc4dfbb0cd153eba7d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is flagged as malicious. The document body, though heavily obfuscated, contains references to 'Barron's TOEFL iBT 16th edition PDF', suggesting a lure to disguise the malicious links. The presence of numerous SEO-optimized PDF links further indicates a link farm or spamming operation.

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/wb?keyword=barron
    • http://files.deluxehomestaging.com/uploads/1/3/1/4/131454816/7656155.pdf
    • http://files.scfoodaccess.com/uploads/1/3/1/8/131856158/gezelotonixoz-nojefirimaputag-bulipo.pdf
    • http://files.northjardotchurchofchrist.org/uploads/1/3/2/6/132683252/6405121.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kaxepetumikikexozifaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/42267549098.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/free_video_game_ringtones.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/tabesiniki.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/wuwotedaropalibenik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33435760041.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/59153935844.pdf
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/infierno_de_dante.pdf
    • https://cdn.shopify.com/s/files/1/0435/0931/7787/files/download_blob_as_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/71910939430.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/vosujekelugudijebekijifez.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/wetusi.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_off00006048.bin
835602cd21672c591f240c95fd6108db8c2c94a2b6f78ff288b1c8a983af9287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6048 5560 bytes
font_01_sfnt_off00007328.bin
61b0e1d0b60fd3c8b69fe1148ef41b67d52abc592c5234de0def8e8c8f40a794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7328 10016 bytes

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