Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbef987c08664c8…

MALICIOUS

PDF

54.2 KB Created: 2020-08-11 03:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 073bcba770797dbe452cf749b45f5d3d SHA-1: 17675e9dd4ec7dfe962c0cb8e3e4a6aa9a58acf8 SHA-256: 0cbef987c08664c8e2fac266f9343ddae6957fb5fca39209706a03733c3353b2
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The primary malicious activity observed is the redirection to potentially harmful external sites, likely for phishing or malware distribution.

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=top+250+movies+imdb+list+pdf
    • http://kibujage.andrewmoschetti.com/uploads/1/3/0/8/130814328/sonimitodesuzavo.pdf
    • http://files.citizenkenn.com/uploads/1/3/1/4/131438541/xoveriboje-sozukib-vemomizo-jivorixubek.pdf
    • http://files.enloearts.org/uploads/1/3/0/8/130874067/bbdadabb005c6.pdf
    • http://files.mainstreamwithnonspeakingautism.com.au/uploads/1/3/1/3/131380181/276544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/24947390146.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/lesoxumedage.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/basel_3_pillars.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/poxopajapalog.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/convert_to_word_document_for_editing_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/79196864616.pdf
    • https://cdn.shopify.com/s/files/1/0431/4936/1314/files/14547356404.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/98678105012.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/gutuvejobewivuxuzoduxepa.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_off000089c1.bin
54ead210df2f8a702c2eb532870ca470205e2f7940e44a99c493f6b30060ded2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C1 5112 bytes
font_01_sfnt_off00009b3a.bin
18b0722f8a4b8a11f0eea371495f1b6d77f70e468654e326850bbb0b4567df14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3A 10212 bytes
font_02_sfnt_off0000be2d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2D 4324 bytes

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