Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a232901f6ea3a95…

MALICIOUS

PDF

41.5 KB Created: 2020-08-26 23:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b8bd8d8eedc05aa74b84b16a366d4bc SHA-1: 1bc1423923e472db10c58e172f7fb5e589fa6289 SHA-256: 5a232901f6ea3a9568e0551b94fa0c0701d7265b51429581c35130df11f40c28
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the ML classifier's high confidence score. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The presence of numerous embedded links, many pointing to benign Shopify domains, suggests a link farm tactic, but the primary malicious link is clear. The document likely aims to trick users into clicking the malicious link, which then redirects them to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/pify?keyword=autocad+civil+3d+2018++trial In PDF document text
    • http://niwafabed.livingyourbestidlife.com/uploads/1/3/1/0/131071278/7343567.pdfIn PDF document text
    • http://fazopume.recognizethesacrifice.org/uploads/1/3/0/7/130740051/jimazerali_budidegarubukif_lisegobasogama.pdfIn PDF document text
    • http://dagabati.goodshortstories.net/uploads/1/3/0/8/130874038/04556dcab29f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9449/7698/files/osborne_books_tutor_zone_chapter_activities_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/1557/8279/files/assassin_s_creed_pirates_apk_data_revdl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7754/9728/files/90511635257.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/soluloku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/47075132415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3366/5441/files/bazeza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/25344464618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/big_data_tutorialspoint.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/679352823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/biceps_workout_video_free.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC6 5488 bytes
SHA-256: 603b65f9598c51bb68ceca550fca0021206a08fc2c3636a8c77cfa99b9be30a7
font_01_sfnt_off00006e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7A 13764 bytes
SHA-256: bb7e6b18e23c7cf079b503ebcf70da066f0383178cd12e33f8328ef7664e5fbe

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