Malicious PDF — malware analysis report

Static analysis result for SHA-256 0231f6c5e0c8836b…

MALICIOUS

PDF

59.5 KB Created: 2020-08-11 03:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39fa868fab0c5e9e63f2a5cce4bf639c SHA-1: b4524eaf37c969c8405d2b2b58ca40f94e8f625a SHA-256: 0231f6c5e0c8836bd71cf0df1721ce641dc44fcba1aa273145c9f9bd541bf710
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One critical heuristic indicates that a link within the PDF leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Wordly wise book 8 lesson 2 answer key pdf' and the malicious URL, suggesting a lure for users seeking educational materials. The presence of numerous external links and the malicious redirector strongly indicate an attempt to distribute further malicious content or conduct phishing.

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.ru/pify?keyword=wordly+wise+book+8+lesson+2+answer+key+pdf
    • http://files.quickstitchplus.com/uploads/1/3/1/1/131164157/tirutisiwota.pdf
    • http://kegib.izzyclarkfilm.com/uploads/1/3/2/6/132681670/eaf8544531.pdf
    • http://files.goeticrecords.com/uploads/1/3/1/1/131163620/papefu.pdf
    • http://vijojov.singerfedun.com/uploads/1/3/1/3/131379510/2a41d1d3dbbf54.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/resident_evil_2_gamecube.pdf
    • https://cdn.shopify.com/s/files/1/0431/8294/8506/files/sudodenav.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/saint_row_3_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0436/7836/7897/files/quran_arabic_words_written_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/certainteed_landmark_ir.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/wezes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/kijebesonosiwesoxigarav.pdf
    • https://cdn.shopify.com/s/files/1/0435/9602/1919/files/jobuxopudisojenukivofag.pdf
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/search_inside_yourself_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/bugasubomunepil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1660/files/85512951605.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8627/files/38925702491.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000906c.bin
d1d056b74a968d8d9add63fea1963ff95e56d44836f5c5da2d18cb85fc752990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906C 5480 bytes
font_01_sfnt_off0000a32b.bin
275dac222238e434ade73429c998e37219a9d4821b1bf272a8551d711b109d7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA32B 15424 bytes
font_02_sfnt_off0000d2ea.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 4324 bytes

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