Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d5d27a76752d09…

MALICIOUS

PDF

99.8 KB Created: 2020-08-25 03:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9ede0798d703c0da360e80a11bcbf6f SHA-1: 7cae7a457901490307ec141efd01f0c7207b5d5b SHA-256: 82d5d27a76752d094ad11230c41d76bd0c799f471202dd5e0dc0ff2b25b4b644
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged as malicious due to its inclusion of a link farm containing numerous external PDF links, with a primary redirector pointing to a known malicious domain. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting it is the intended lure. The ML classifier strongly supports the malicious verdict.

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=aua+guidelines+prostate+biopsy+antibiotic
    • http://files.kylespestsolution.com/uploads/1/3/1/3/131383380/e5f3b1a6407c.pdf
    • http://jekuwu.mixelle91.com/uploads/1/3/2/8/132814930/toramonovalimadu.pdf
    • http://luzitoru.creative-sportsconcepts.com/uploads/1/3/2/8/132814930/99f938a.pdf
    • http://kufefaf.greatautismresources.com/uploads/1/3/1/0/131070571/9252334.pdf
    • http://vokix.prairiewindsorff.com/uploads/1/3/2/8/132814930/revifevep.pdf
    • https://cdn.shopify.com/s/files/1/0462/7103/7602/files/5073649594.pdf
    • https://cdn.shopify.com/s/files/1/0432/8295/6443/files/iphone_5s_size_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/leessang_lyrics_you_are_the_answer.pdf
    • https://cdn.shopify.com/s/files/1/0432/0005/3408/files/92826284871.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/58823122261.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/vulege.pdf
    • https://cdn.shopify.com/s/files/1/0429/2457/2835/files/brother_printer_scanner_scan_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/6195/3191/files/tipedurakizafavogamud.pdf
    • https://cdn.shopify.com/s/files/1/0435/6174/6595/files/30804252969.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/rofizomerimaferejovev.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/wheelchair_platform_lift_for_car.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/xamilanawesifaguvilug.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_off00013320.bin
ac43018d72e33b1bbc1f8397c484869bdbdfe5fb9435a4f0b3fbb3a33023dd22
pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 5352 bytes
font_01_sfnt_off0001455c.bin
3425c1535777d699c8ed4dfd14f40263299e939a71886336f47a98a2d294f42a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1455C 14564 bytes
font_02_sfnt_off00017349.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x17349 4324 bytes