Malicious PDF — malware analysis report

Static analysis result for SHA-256 0025e1098f6c3359…

MALICIOUS

PDF

46.4 KB Created: 2020-08-30 22:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9d35b54d2ef46feabb304a341e7cc80 SHA-1: a8354ae0b848c0efc8ff42a4e796b274f2a39773 SHA-256: 0025e1098f6c3359886d779489b4e46d7093ebe452dabbbbafdb2ea3970a7b15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=grade+9+reading+passages+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are to benign Shopify URLs but one critical link to the malicious redirector. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise it as part of the content.

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/wix?keyword=grade+9+reading+passages+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/corn_leaves_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/60103470506.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/25425520358.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4600/files/2573435506.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/pdf_editor_free_online_tool.pdf
    • https://static.usrfiles.com/ugd/b8c837_88832ff918c442568b08c5cada25cd28.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b688098da540dca333d2bb75b5df94.pdf
    • https://static.usrfiles.com/ugd/edb4a7_04b62da93578453481b5db6b2858764e.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/merusirixiguloju.pdf
    • https://cdn.shopify.com/s/files/1/0437/8243/9063/files/kandinsky_rouge_jaune_bleu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/xufuderixovojixoje.pdf
    • https://cdn.shopify.com/s/files/1/0440/8783/6822/files/wegalebipowifasagagesene.pdf
    • https://static.usrfiles.com/ugd/1cc777_5b864a937d6a4c4581710215900f2b23.pdf
    • https://static.usrfiles.com/ugd/b8c837_548c94c05dee4178b9bbfeab9398e19c.pdf
    • https://static.usrfiles.com/ugd/3fc21f_efe138f82a6a41158f1a6e6ba809a5a8.pdf
    • https://static.usrfiles.com/ugd/361045_a91728eabb164ad1849b96804094ad92.pdf
    • https://static.usrfiles.com/ugd/b8c837_95a10b81cf5340b9a07e7fe26bdcb1bd.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_off00006a2d.bin
256f21d74c2d76f03c3db69063c961e4f763de7f23065193593b46b366e5ed0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2D 4964 bytes
font_01_sfnt_off00007b1a.bin
7339d8f97cd3fd9c1dc884dbf4b3eee6c68b13df63fbd2f528606d9a0ec3ea4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1A 10368 bytes
font_02_sfnt_off00009e8d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8D 4324 bytes

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