Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50a30a1bb9a0cba…

MALICIOUS

PDF

41.2 KB Created: 2020-08-07 17:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df58961f12556662965bccf4693a8f3 SHA-1: f12ce53c43ffc62624e9907a21b5c672a91ca052 SHA-256: c50a30a1bb9a0cbadf6104eed9ade0960ad31869f98332a00c3e61afa639fe8b
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO link farming to improve search engine rankings. One of the primary links, disguised as a worksheet, redirects to a known malicious URL. This suggests the document's purpose is to drive traffic to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=synonyms+worksheet+for+grade+5+pdf
    • http://files.lakesidepaletteclub.org/uploads/1/3/0/7/130738662/gofenu-puzijajem.pdf
    • http://files.shopjoliboutique.com/uploads/1/3/1/0/131070374/kamobidej.pdf
    • http://zomivizak.fordjudoclub.org/uploads/1/3/1/8/131856330/468983.pdf
    • http://files.helpabtrucking.com/uploads/1/3/1/1/131163507/wawudinujonol.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/bebogaxuzinepurorekimonaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/rubanisemizenorawofik.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/jetibefo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/32106030242.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/65499942096.pdf
    • https://cdn.shopify.com/s/files/1/0445/6343/1588/files/php_open_file_in_new_browser_window.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/bukukojapetasujekafugufet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/rofigoguv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/tesis_de_calidad_total.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/bebodul.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006119.bin
ebacef4bdbd80b202b38722e2f6fd9248384768ee84699550528bc56fd0f7f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6119 5908 bytes
font_01_sfnt_off00007528.bin
3f821765c4d0a8f60faa1e7733f01097f0859a413b7597f776a91ad0bfcad751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7528 10132 bytes

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