Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbe64f477b000ab…

MALICIOUS

PDF

49.2 KB Created: 2020-08-21 14:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 005f4f546ffe5692b1789af9d7efec4a SHA-1: e4c79ff3bacfdb1e3177ad7375f4d7809d474efa SHA-256: 0bbe64f477b000ab1907559d2c653877e129441d715e0d13f1c65187755270e1
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or SEO link farms. The primary malicious link identified is 'https://ttraff.cc/pify?keyword=ctet+form+last+date+december+2019', which is designed to trick users into clicking through to a malicious destination. The document body, though heavily obfuscated, contains references to exam dates, suggesting a lure to attract clicks.

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.cc/pify?keyword=ctet+form+last+date+december+2019
    • http://zozev.huffhillsskipatrol.org/uploads/1/3/1/3/131398244/6856306.pdf
    • http://files.hairandmakeupbylu.com/uploads/1/3/2/6/132695445/7522085.pdf
    • http://files.biocoreintegration.com/uploads/1/3/1/3/131380591/4215050.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6657/2443/files/calderas_acuotubulares_y_pirotubulares.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/49160535626.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/o_bestiario_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/73596807230.pdf
    • https://cdn.shopify.com/s/files/1/0437/4590/2746/files/87157184803.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/bubijibifasamokasipef.pdf
    • https://cdn.shopify.com/s/files/1/0433/9607/1578/files/74197298004.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29331550606.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2181/files/small_story_books_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/16068714227.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ae.bin
cfb78f982bf3702d3da0916e94ae64078a654bc052b253f18942259eacfde423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 5696 bytes
font_01_sfnt_off00007af2.bin
9a9ce7d08bec4963cc2783a66d4cf355974c6bc04d8ff8431b7567b0c73d8ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF2 10624 bytes
font_02_sfnt_off00009f42.bin
2ac0a33d86fe2f69241fdd33b8be2c239c957bc82aa5c2e556ef5ecfc1a5fbba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F42 17200 bytes

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