Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e4ec99e7ee8910…

MALICIOUS

PDF

47.7 KB Created: 2020-08-15 07:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a75ca446f7a4a8f933afe333b134f205 SHA-1: 240ef1a097ff62c1286ce6cd07a4b5c81c14a2ae SHA-256: 09e4ec99e7ee89106d00d0c046dd996d807ce7b40b6996a79784144ee2690d66
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 hosted on various domains, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=betternet+vpn+for+pc+with+crack', is identified as a malicious redirector, indicating an attempt to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=betternet+vpn+for+pc+with+crack
    • http://files.demesstainedglass.com/uploads/1/3/0/7/130739450/de480.pdf
    • http://files.diamondbackcombatives.com/uploads/1/3/1/4/131454523/5842649a1a067b.pdf
    • http://files.countryclubkennelsgrovecity.com/uploads/1/3/1/4/131437457/tefol-fakavuw-tezawig-tajukotuxud.pdf
    • http://libavir.llaycommunitychurch.com/uploads/1/3/2/6/132681670/tokesaj.pdf
    • http://files.copperpondlodge.com/uploads/1/3/0/7/130739758/wuradatep-samumarubon-zabubur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/4000/4501/files/fezitokujakubezodarejudig.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/lozopapikapugoxuwopafov.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/witafepuzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/janonerogexugifazez.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/remixexasogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/93712563324.pdf
    • https://cdn.shopify.com/s/files/1/0431/9202/5249/files/ovarian_tissue_cryopreservation.pdf
    • https://cdn.shopify.com/s/files/1/0440/2456/1829/files/english_speaking_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/43320211184.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/kawalotemimepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/90001955572.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_off00006f25.bin
a0a797fcedd681c41116d044a41abb7069dceef3d91b63e84c49172c9af00ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F25 4944 bytes
font_01_sfnt_off00007ffe.bin
a98a67d76b8baed8e5a8ebc21e978b578a8d3de8e46a2eaaede70472a0704a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FFE 10628 bytes
font_02_sfnt_off0000a38a.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA38A 4324 bytes

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