Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7728fc310b0220…

MALICIOUS

PDF

50.4 KB Created: 2020-09-16 15:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0379f1333394524ea0be6da69bf7df17 SHA-1: bd2dcc1c90419494b46fe4c1fd4592d96c38c72a SHA-256: 5b7728fc310b02202fee456dc57884b926ad56748fe038b4181ec769f33592a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'a long walk to water answers chapter 1'. The presence of many external PDF links, some benign and some potentially malicious, indicates an attempt to distribute further content or lead users to malicious sites. The ML classifier strongly flagged this PDF as malicious.

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=a+long+walk+to+water+answers+chapter+1 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://00ab5f35-bff0-42f8-b3a5-9c709dd102d3.filesusr.com/ugd/d5415a_77b6626309054234a20fa04d696a9254.pdf?index=trueIn PDF document text
    • https://f6106b7c-41d5-4a2a-ae9b-3a69858eab92.filesusr.com/ugd/e3325f_e41d9d393955474d8f4f0b8767b03686.pdf?index=trueIn PDF document text
    • https://a6cfe44e-a6eb-4efe-91e9-8818fffa49e4.filesusr.com/ugd/277b62_d1633efa0b24476ea47e952cb2500e8b.pdf?index=trueIn PDF document text
    • https://5d7c3524-a408-4acc-86db-9e1929fcf747.filesusr.com/ugd/66f3f9_eaf8e1cec8b647ddb04bee1c953259de.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/15736610637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/47458951941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/potadivobuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/willmingtons_guide_to_the_bible_logos.pdfIn PDF document text
    • https://dcdbece6-7056-404a-a494-22e284d9bf4a.filesusr.com/ugd/e3ff21_8bca41cea6df4e16b832422f310098f0.pdf?index=trueIn PDF document text
    • https://019e0151-fdc4-494c-b4a0-1e5aaf7a7cfc.filesusr.com/ugd/b148e5_ba5731a52f6243d6a4300206ae47b299.pdf?index=trueIn PDF document text
    • https://3fcb76e9-2671-4fcb-98ab-b6f9d78d52a4.filesusr.com/ugd/0af078_dcbb2e3425524604b3f9872f6035e212.pdf?index=trueIn PDF document text
    • https://af80dcd2-820a-49e7-a910-4a666469cc87.filesusr.com/ugd/314c35_9d24f01b657745a49869a2d2f558d821.pdf?index=trueIn PDF document text
    • https://3b683638-ed1d-4594-9fe7-3db8b44ca9b2.filesusr.com/ugd/a2de88_95e92bb3ddb04a8f999b29d3206bc2e4.pdf?index=trueIn PDF document text
    • https://0a5c62c0-0986-4660-b58c-5b294725598b.filesusr.com/ugd/58a813_c1c71de64edb4c72aa6435abf3e4d31f.pdf?index=trueIn PDF document text
    • https://ba8197a9-f735-42d4-9806-6d024338e295.filesusr.com/ugd/ac8c68_2ba951a2260a48e79d26bf8be10f8272.pdf?index=trueIn PDF document text
    • https://f8d0f44c-25a0-4ca5-b06d-6bdc3b4c4336.filesusr.com/ugd/dcf311_e35930474a854d909e277cd7fefdefc3.pdf?index=trueIn PDF document text
    • https://24b1b06d-9398-40a4-94d5-d67e1615a0b4.filesusr.com/ugd/8db125_ae67dac27b454bf6a176b9addf30e5d4.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000784e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 5132 bytes
SHA-256: b89bbbba95b242608a45161b8417f1240b734568ac6f15e2d8a58252705e86c1
font_01_sfnt_off000089cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89CF 9984 bytes
SHA-256: 90500122a88d3bf2d5be29badca699823e51f9cdb9939b11f695441a5fd7515a
font_02_sfnt_off0000ac0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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