Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12644482b05f246…

MALICIOUS

PDF

43.8 KB Created: 2020-07-26 15:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08173db82b52839b84079dcf87fc7b25 SHA-1: 0cd08852776a4f439ca4e0bfb66e5383eb5156ff SHA-256: d12644482b05f246eb35710ddb4526b0f157a571c5728af5308e964c1ef65969
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is ttraff.ru, which is used in conjunction with SEO link farming tactics. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, likely to entice users to click the malicious links.

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/wb?keyword=comparing%20and%20ordering%20numbers%20worksheet%20grade%203%20pdf
    • http://files.thesouthernsaltymermaid.com/uploads/1/3/0/7/130740496/mumapo-zewaxakofiw.pdf
    • http://files.bollywood-dreams.jp/uploads/1/3/2/6/132683070/losuwe_napasebaw_fodawot_zakazezeg.pdf
    • http://files.npmafc.com/uploads/1/3/2/3/132302993/rirajevizazi.pdf
    • http://files.alaurakitchen.com/uploads/1/3/1/3/131379594/vugize.pdf
    • http://files.bollywood-dreams.jp/uploads/1/3/2/6/132683070/losuwe_napasebaw
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/sixunomesoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/wikukofuwusoruwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/ritanamifufidatorufavafij.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/76478089137.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/sufeberezop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutiga.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/nuzemoxife.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/vazotipitizixafujiwepar.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7669/files/nogiruligifozexorodesoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/wenev.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/dakixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/ruwigojoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/vupakabixidad.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/92684309715.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_off00006b76.bin
1fb9de21fe9ad8ad9b2244a920c80bb2170782a19dc2d41944f7381347af5d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B76 5788 bytes
font_01_sfnt_off00007f07.bin
43362434937bd4aa22baab693f4dae932e356e4f37db3ed7a599d1f061d5c044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F07 10052 bytes

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