Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf7fdae2838cc56…

MALICIOUS

PDF

46.2 KB Created: 2020-08-19 10:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60b923076a56744516a17d02193c54ca SHA-1: 067638e6b38077b8bcec0cd83a18b6d04427a7fe SHA-256: 0cf7fdae2838cc569d64afe0878c35a41acdcbc11c7d4b93156601f1e1216ead
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host other PDFs. One prominent link, 'https://ttraff.com/pify?keyword=curriculum+vitae+template+2019', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Curriculum vitae template 2019' and the malicious URL, suggesting a lure to trick users into visiting a potentially harmful site. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=curriculum+vitae+template+2019
    • http://files.prostylearch.com/uploads/1/3/0/7/130740385/bokojewibaj_fotoxulevoruk_felozoba_ninibaxe.pdf
    • http://rafuk.jeromesbistro.com/uploads/1/3/1/4/131407995/3ab253a524e30.pdf
    • http://files.hallielee.com/uploads/1/3/2/8/132815961/5788720.pdf
    • http://dumuz.homeschoolbrew.com/uploads/1/3/1/6/131606624/sabowexefuwus-maruweko-dumazatoli-biwozo.pdf
    • http://files.texasmesquitebbqandgrill.com/uploads/1/3/0/9/130969386/xapebagefavevewasadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/jazelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/51364467498.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/rotarutilisifikomuwebodat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/xivulivedufofizekajub.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/vaxixubezinidawalev.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/49415149906.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/miwosirezizapex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/borges_el_aleph.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rinajimakonewob.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/jerufomusifajowefif.pdf
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/tosamizimufatatu.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_off000069a9.bin
8ed94c71184f103856ea85c37508774ac58786bd9aea2ee0331fb14c0f0649e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A9 5132 bytes
font_01_sfnt_off00007b29.bin
b5e0d9bdbbc2a785f4f4cda97e975b02933fceceae85d9a7367c0fb4ae8cef16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 9888 bytes
font_02_sfnt_off00009cff.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFF 4324 bytes

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