Malicious PDF — malware analysis report

Static analysis result for SHA-256 11088c34f7b5aae7…

MALICIOUS

PDF

47.9 KB Created: 2020-09-17 05:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fae741e83895eda07852d8ad2fee142e SHA-1: 9c0ccc5fb13c27c5bd6fa9228f95d74d81bb41b8 SHA-256: 11088c34f7b5aae7dd16718798618927223cd56bffa8c6c3795d0e2e00305d0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, including a redirector URL and a link farm of other PDFs. The document body, though heavily obfuscated, contains the redirector URL and other PDF links, suggesting an attempt to drive traffic to malicious sites. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.link/wix?keyword=econ+lowdown+answers+fiscal+policy
    • http://files.mshaileyswebspace.com/uploads/1/3/1/8/131857565/vofamaf.pdf
    • http://files.shanehagedorn.com/uploads/1/3/0/8/130874125/miwevufunon.pdf
    • http://libote.mazzulab.com/uploads/1/3/2/7/132740228/1190371.pdf
    • http://files.wholesalesportsplus.com/uploads/1/3/0/7/130739776/9882f80c4957bcd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/3024/9377/files/10952899035.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4640/files/2777850670.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/34756941671.pdf
    • https://cdn.shopify.com/s/files/1/0428/4393/0791/files/88267271712.pdf
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/run_android_application_adb.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/niwemukovutedat.pdf
    • https://d67465af-0cf9-45c7-bc64-50abd74f4468.filesusr.com/ugd/f65518_2daa7c6cc7be4c5fa0a8c37c5985549d.pdf?index=true
    • https://ab888b9d-dc70-4c4b-96b0-bbfffbdd6122.filesusr.com/ugd/3e5db3_6625136eade4432388fd535dce7268b7.pdf?index=true
    • https://23058313-814f-4e70-83bc-8a8849f83ee4.filesusr.com/ugd/f08e01_a886450db3364de6a712df11a8c56bfa.pdf?index=true
    • https://f8c42c15-a465-439f-9ff3-270ee1f096ac.filesusr.com/ugd/95089d_be67f357c12f44178a2f150130edc933.pdf?index=true
    • https://4beb3212-17fa-4043-b7bf-c2108d7e11a5.filesusr.com/ugd/8a05ec_c585dfef2c744f22b04b9e5f32809fb6.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d5c.bin
b1d27a4ee6a01aa65984bc3fdcf1368c6e10d2725a767cf4621acfd576a6cbf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5C 5300 bytes
font_01_sfnt_off00008f8d.bin
349ba8bba719fc98f812f6f7f82631ec251da70e338ddd99b34b46b19224a963		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8D 10376 bytes

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