Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d4bf57e3b2bef8…

MALICIOUS

PDF

45.0 KB Created: 2020-10-10 00:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb622f80741b7de14f67498be72567ec SHA-1: 419d33484aa2ad4a8bc159e2ce8708391c590828 SHA-256: 83d4bf57e3b2bef8907ca44c815b826bd1cba6568062f616858fc115841a4dc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ggtraff.ru/strik?keyword=tape+diagram+definition+math, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain the malicious URL within its 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://ggtraff.ru/strik?keyword=tape+diagram+definition+math
    • http://kasagad.lokakuunliike.com/uploads/1/3/1/6/131606162/rorubisulo.pdf
    • http://files.paolobenegiamo.com/uploads/1/3/1/3/131380555/xejuxivejefolor.pdf
    • http://ludek.aubreylloyds.com/uploads/1/3/0/7/130775389/3523938.pdf
    • http://nosuvogux.kitchen-envy.net/uploads/1/3/2/6/132695829/vafivu-turofime.pdf
    • http://files.asapsperry.com/uploads/1/3/1/3/131379183/4268140.pdf
    • http://tonow.oldschoolsailing.com/uploads/1/3/1/6/131606295/zonijitekojo_xasonitamet_gilapuzenilekev_muraf.pdf
    • http://files.interculturallanguageservice.com/uploads/1/3/2/7/132740405/lifidefarajalurivox.pdf
    • http://zaxuxoro.immortalizedimage.com/uploads/1/3/1/3/131380485/dorup_fegixadoviratul_vudowajabavose.pdf
    • http://files.theunreached.blog/uploads/1/3/0/7/130739713/8057dccda1ce439.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4416/0156/files/kevamulatukivo.pdf
    • https://cdn.shopify.com/s/files/1/0496/0786/8579/files/king_ecbert_died_vikings.pdf
    • https://cdn.shopify.com/s/files/1/0431/7357/6865/files/98126296957.pdf
    • https://cdn.shopify.com/s/files/1/0437/9725/0210/files/polawasebemab.pdf
    • https://cdn.shopify.com/s/files/1/0438/1864/7709/files/mixcraft_8_free_download_with_crack.pdf
    • https://cdn.shopify.com/s/files/1/0485/3222/6203/files/ispconfig_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9813/files/naked_genetive_latin.pdf
    • https://cdn.shopify.com/s/files/1/0434/0468/9558/files/82435893179.pdf
    • https://cdn.shopify.com/s/files/1/0482/8777/6930/files/3651582275.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fd3.bin
595f5f82876beb3dd62e900fdf0d5a9317ed00efe62f6c376117035b5ee9df62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD3 5196 bytes
font_01_sfnt_off0000815c.bin
fe00011896ddeff1d37f9803bc070bb6f89a90e60d5fda10da70803fb99adfea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x815C 10908 bytes

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