Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b649cd683357e5…

MALICIOUS

PDF

60.6 KB Created: 2020-09-20 06:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e30ee9212f41a2d5ee1e3db437063c97 SHA-1: 7a8151de8a7d577b9890d92b5f742aeee7c417b6 SHA-256: d5b649cd683357e58f5da3ded26d9ca28aa88cc4ecd1ed4b9a4c8af5ba3f1b5e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=aerofly+2+apk'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect users to potentially harmful content.

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.me/wix?keyword=aerofly+2+apk
    • https://cdn.shopify.com/s/files/1/0440/0935/7477/files/64190498360.pdf
    • https://cdn.shopify.com/s/files/1/0463/7337/2059/files/old_brick_wall_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/17376899256.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/33321610199.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/kugete.pdf
    • https://10d6ac18-64cf-43ad-b9dd-52960b5b38c3.filesusr.com/ugd/913720_01e7803a86bb43699b8a9390e9f91974.pdf?index=true
    • https://282b9f32-67c2-4d62-aaac-f329396cf6f9.filesusr.com/ugd/f459ea_329c4a312b584f60bea9a89b83ab8745.pdf?index=true
    • https://61c1eaac-b774-4be5-9514-0e7c901fffdb.filesusr.com/ugd/956c05_c83b2efab552450f92c34372a4e6a057.pdf?index=true
    • https://e5ce932c-4356-4897-8879-a6b6de200313.filesusr.com/ugd/e00bd3_753d37b1cda34b959c5788d3f1a110cc.pdf?index=true
    • https://6b40b6e8-d849-4f1e-af1c-a257678364ac.filesusr.com/ugd/c4f63d_3b19d9c8b59a491f97c510396272c2b9.pdf?index=true
    • https://48e7497d-bcab-4d5a-9ac0-396efb565f76.filesusr.com/ugd/062c90_2cf709849e0d4bda8f62026f2d43d37c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/6652/3809/files/10_day_belly_slimdown.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/67041107408.pdf
    • https://cdn.shopify.com/s/files/1/0437/1369/1799/files/jean_klein_yoga.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
stream_006_off0000b589.bin
d8b9c566d345e95294ad5e830ab1ea318e1ca0dea461ad119116e1219f01f600		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB589 27040 bytes
font_00_sfnt_off00007657.bin
1f9c7663618c51690125765f286419e92f3432f1c05d5acdd5402ad59207c887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7657 5004 bytes
font_01_sfnt_off0000877b.bin
ea97a6ab7b89536b79e108ee5b2e8bf37df69ae882c1dfb2b89752c343153a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877B 14784 bytes

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