Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98aab6aedf7ec64…

MALICIOUS

PDF

37.9 KB Created: 2020-09-20 13:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7e8e30f1d0f45e1005aa1122d40e0a2 SHA-1: 0627b528c5c2c326977dee2b83d7b876daea8690 SHA-256: b98aab6aedf7ec64e4be607b730112ad343cfe2248da281f8e2551c6dc7638db
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The document appears to be a lure, masquerading as 'Ad as practice sheet answers' to direct users to the malicious URL. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to increase visibility.

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=ad+as+practice+sheet+answers
    • http://lizabavuf.crystalbluefeatherart.com/uploads/1/3/0/9/130969465/33c9ae7839f.pdf
    • http://bilofeze.tmsdrama.com/uploads/1/3/1/3/131380729/borivipu.pdf
    • http://bodol.danaeirismcqueen.com/uploads/1/3/0/9/130969360/vugamigidusikut-sovuku-nulifusurelufox-mozuga.pdf
    • http://jelututi.thompsoncollegeconsulting.com/uploads/1/3/0/8/130814085/6126268.pdf
    • http://nesexo.gladiatorslive.com/uploads/1/3/2/6/132682076/9b18b721.pdf
    • https://9a9813a9-7295-42f3-ba45-46e4e3085ad2.filesusr.com/ugd/9e14ca_d0b6b360069d4343be0a9b9c6435f635.pdf?index=true
    • https://7686b103-adaf-4a86-8b2a-43eeac86d978.filesusr.com/ugd/565485_288bc5307dbd4f68ba6eee7108e01794.pdf?index=true
    • https://6d51f974-8437-48aa-bea7-56ea14d7aded.filesusr.com/ugd/7a359d_10ae31e969d44236b1c78946cc73315a.pdf?index=true
    • https://da676061-aa7c-4c89-ab94-9f21a75a321e.filesusr.com/ugd/ced2dc_27605a31b32c4111bd6113d0c8ea5fa2.pdf?index=true
    • https://5cf0c98b-cf72-4404-8b65-eeb7259ed5bc.filesusr.com/ugd/71fd01_31171d8506a84ba89cf4e4d6d6c233dd.pdf?index=true
    • https://672ebeca-eec0-40ec-823d-a4c635d569e5.filesusr.com/ugd/95ea6b_dc2b1c6677474f44ae19a31e0164cb0d.pdf?index=true
    • https://f3229c25-1e0f-4239-a674-e8042cf3f201.filesusr.com/ugd/36f25b_25d30182478149deb4a584aca24b09a5.pdf?index=true
    • https://d5ac0ea2-1d2a-4ed8-85a2-ab484366eabd.filesusr.com/ugd/771ea4_eaeaaecbda274904944c1b89ae7f1897.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/app_to_instagram_private_account_videos.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/juvajiri.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_off00005655.bin
eacff635c1250ead4f2bf95d66f8879ed29f59123922e91150b39f7e2deba916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5655 5212 bytes
font_01_sfnt_off0000681c.bin
5edafd66d77db1476660fa96a1ecd1580083512c74b4a566cb186b14677334a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 10128 bytes

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